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Form 4 Mathematics Paper 1 Exam Revision Questions With Answers Set 2

The length of a rectangle is increased in the ratio 4: 3 while its width is decreased in the ratio 2 : 3.
a) Given that the original rectangle measures 18 cm long and 15 cm wide, find the dimensions of the new rectangle.
b) Determine the ratio in which the area of the rectangle changes and state whether it is an increase or a decrease.

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8. In the figure below
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50. Pamela has one-shilling coins, five-shilling coins, ten-shilling coins and twenty-shilling coins in the ratio 8 : 5 : 4 : 3. If she has a total of 60 coins, determine the amount of money she has.
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53. Find the size of each exterior angle of a regular pentagon.
54. The straight line whose equation is 2y = 3x + 6 meets the x-axis and the y - axis at P and Q respectively. Write down the coordinates of p and Q.
55. A construction company employs 24 men to work 6 hours a day for 20 days in order to complete a certain job. For how many more hours per day must 30 men work in order to complete the same job in 12 days?
56. Given the column vectors P=#((-2),(3)), q=((12),(-8)), r=((6),(-9))# and that #a = 2p – 1/2q +2/3r# express a as a column vector and hence calculate its magnitude |a|.
57. By selling an article for sh 725 a trader usually makes a profit of 45%. During a clearance sale the trader reduced the price of the article by 20%. Find the percentage profit the trader made.
58. The actual area of an estate is 3 510 hectares. This estate is represented by a rectangle measuring 2.6 cm by 1.5 cm on a map whose scale is 1: n. Find the value of n.
59. A vertical pole 3 metres high casts a shadow 5 metres long on the ground. Calculate to the nearest whole number the angle of elevation of the sun.
60. Six men take 10 days to plant 480 trees. Find how many trees 9 men can plant in 8 days.
61. A group consisting of 60 adults and children hired a bus for sh 18 600 in order to take a trip. To raise the money each adult paid sh 400 and each child sh 250. Find the number of adults and the number of children in the group.
62. A cylindrical tank of diameter 1.4 m and height 1.2 m is two-thirds full of water. The tank is filled using a cylindrical bucket of diameter 35 cm and height 20 cm. Find the number of buckets required to fill the tank.
63. Four ropes measuring 12 m, 18 m, 24 m and 36 m are cut into pieces of equal length so that an exact number of pieces are obtained from each rope without wastage. Find the longest length of each piece.
64. The sum of the interior angles of an n-sided polygon is 720°. Find the value of n and hence deduce the name of the polygon.
65. Fig. (i) above shows a triangle ABC in which AB = a cm, BC = 12 cm and angle ABC = 30°. Fig. (ii) shows a rectangle PQRS in which PQ = 9 cm and QR = b cm. Given that the area of the triangle is two-thirds the area of the rectangle, find the ratio a : b.
66. A draper bought some shirts and some trousers from wholesaler A at sh 200 per shirt and sh 600 per trouser spending a total of sh 22 000. If he had bought the same number of items from wholesaler B he would have paid 25% more for a shirt and 15% less for a trouser and he would have spent sh 700 more. a) Determine the number of each item he bought. b) He sold all the items at a profit of 50%
67. A piece of wire can be folded into a rectangle whose dimensions are such that its length is 8 cm longer than its width. The area of the rectangle so formed is # 468cm^2#. a) Determine i)the dimensions of the rectangle ii)the perimeter of the rectangle b)The same piece of wire can also be folded into a circle. Taking p=22/7, find the radius of the circle and hence calculate its area.
68. A trailer left Mombasa at 10.15 a.m. and travelled towards Nairobi at an average speed of 30 km/h. At 1.35 p.m on the same day a lorry left Mombasa and travelled towards Nairobi at an average speed of 50 km/h on the same road. The distance between Mombasa and Nairobi is 500 km. Assuming that none of the vehicles stopped on the way, determine a) the time of day when the lorry overlook the trailer.
69. Four ships are at sea such that ship B is 520 km on a hearing of 210° from ship A. Ship C is due north of ship B and due west of ship A. The fourth ship D is 100 km on a bearing of 340° from ship A and 240 km a bearing of 070° from ship C. a) Draw a rough sketch showing the positions of ships A, B, C and D. b) Use your sketch to find the size of i. angle ADC. ii. angle ACB.
70. A trader sold an article at sh 3 600 after allowing his customer a 10% discount on the marked price of the article. In so doing he made a profit of 50%. a) Calculate i. the marked price of the article. ii. the price at which the trader had bought the article. b) If the trader had sold the same article without giving a discount, calculate the percentage profit he would have made.
71. Use logarithms to evaluate #73.48 ÷ {(0.7592)^3 × 0.08723} ^(2/5) #
72. Factorize and simplify as far as Possible. #(15x^2+xy-6y^2)/(5x^2-8xy+3y^2 )#
73. Twenty four men working at the rate of 10 hours a day take 18 days to complete a certain job. How long would 30 men working 9 hours a day take to complete the same job?
74. Solve the equation #3/(2x) =7/(5x-1)#
75. a)Using mathematical tables find i) the reciprocal of 2.754. ii) the square of 4.765. b) Hence or otherwise calculate to 3 significant figures the value of #4.7652 + 1/2.754#
76. Solve for x in the equation #25^x+5^(2x) =50#
77. A cylindrical tank of radius 2 m and height 1.5 m initially contains water to a depth of 50 cm. Water is added to the tank at the rate of 62.84 litres per minute for 15 minutes. Find the new height of water in the tank. (Take p = 3.142)
78. The straight line passing through the points A(-1, 2k) and B(k, -1) is parallel to the line whose equation is 2y + 3x = 8. Find the value of k and hence write down the coordinates of A and B.
79. Jerusha invested sh 50 000 at the rate of 10% per annum compound interest for #2 1/2# years. Kemuto invested sh 35 000 at the rate of 15% per annum simple interest for the same period. Whose investment earned more interest and by how much?
80. a) Find the greatest common divisor of the terms #8x^4y^3 and 2x^2y^5 # b) Hence factorize completely the expression #8x^4y^3 - 2x^2y^5#
81. Evaluate #7 1/2 ÷3/5 of 4 1/6 +8 1/3 times1 1/5#
82. The marked price of some goods was sh 480 000. A salesman sold these goods at a discount of #2 1/2 %#. He received sh 18 720 as commission on the sale. At what percentage rate of commission was he paid?
83. The base areas of two cylindrical containers are #135 cm^2# and #240 cm^2# respectively. a) Determine the area scale factor and hence the linear scale factor. b) If the capacity of the smaller container is #540 cm^3#, what is the capacity of the larger container in litres?
84. The longer parallel side of a trapezium is three times as long as the shorter parallel side. The perpendicular distance between the parallel sides is 15 cm. If the area of the trapezium is #180 cm^2#, calculate the length of its longer parallel side.
85. Three towns A, B and C are such that town B is 90 km on a bearing of 150° from town A and town C is 120 km on a bearing of 060° from town B. a) Draw a sketch showing the positions of the three towns. b) Calculate the distance between towns A and C.
86. The diagram below shows a trough which is 4 m long and has a triangular cross-section. All dimensions arc as shown on the diagram a) Calculate I. the cross-sectional area of the trough in square metres. II. the capacity of the trough in litres. b) The trough which is initially one third full of water is filled by a pipe which delivers water at the rate of 0.8 litres per second.
87. Banda and Chuma live in two towns 240 km apart. One day at 9.45 a.m. Banda left his town and drove towards Chuma's town at an average speed of 60 km/h. Chuma left his town at 10.50 a.m. on the same day and drove towards Banda's town at an average speed of 80 km/h. a) Find I. the distance from Banda's town to the place where the two met. II. the time they met
88. During the first year a poultry farmer had four times as many hens as ducks and one third as many turkeys as ducks. In the second year the number of ducks increased by 10%, the number of hens increased by 25% while the number of turkeys decreased by 20%. At the end of the second year the farmer had a total of 955 birds. Calculate to one decimal place the percentage increase in the total number of
89. The external measurements of a wooden box are 1.0 m long, 70 cm wide and 40 cm high. The wood used in making the box is 1.5 cm thick and has a density of 0.8 g/#cm^3#. The box contains 25 packets of tools. Each packet holds a dozen tools and each tool weighs 108.5 g. Calculate a) the volume of wood used in making the box. b) to 2 decimal places the mass of the empty box in kilograms
90. At the end of year 2000 a cooperative society realised a gross income of sh 33.5 million. The total expenses incurred by the society during that year was sh 20.75 million. Each year 60% of the net income is paid to members as dividends which is calculated per share. During the year 2001 the society's gross income increased by 30% while its total expenditure decreased by 20%.
91. The diagram below shows a rectangle measuring 15 cm by 12 cm from which two semi-circles each of a diameter 5.6 cm are removed. The figure represents the cross section of a wooden block 10.5 metres long. The wood making the block has a density of 0.8 g/#cm^3#. a) Calculate to one decimal place i. the cross sectional area of the block ii. the mass of the wood in the block in kilograms.
92. A school hired a number of buses and matatus to transport a group of students to Lake Nakuru. The number of matatus was three times the number of buses. The hire charges were sh 3 500 per matatu and sh 6 500 per bus. The total cost of hiring the vehicles was sh 17 000. Each matatu can carry 13 students while a bus can carry five times as many. a) Determine the number i. of buses hired
93. Without using logarithms or calculator, evaluate #root3((0.95 times 5.5 times 10.5)/(0.21 times2.09))#
94. Kamemia uses #1/3#of his farm for planting coffee, #1/4# for planting tea and #2/5#of the remainder for mixed farming. He still has 6 hectares of unused land. Find the size of Kamemia's land.
95. Mwaura is now twice as old as his daughter and four times as old as his son. In eight years time Mwaura's age will be equal to the sum of ages of his daughter and son. Determine Mwaura's present age.
96. The straight line passing through the point (-3, -4) is perpendicular to the line whose equation is 2y + 3x = 11, and intersects the x-axis and the y- axis at P and Q respectively. Determine the equation of the second line and hence write down the coordinates of P and Q.
97. Given the column vectors #p=((1),(2)), q=((-3),(-6)) and r= ((2),(-3))# and that #a=3p- 1/3q + r#, express a as column vector.
98. Mutisya left a will directing that his 18 hectare land he divided among his three sons Nyange, Kalweo and Mutua in the ratio 3 : 4 : 5. He also directed that his savings of 3 825 000 be divided among the three sons in the ratio 5 : 3 : 1. If the Kalweo sold his share of land at sh 80 000 per hectare, determine the total amount of money he received.
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100. A cylindrical container of diameter 7 cm contains water to a depth of 5 cm. Ten spherical metal balls of radius 1.4 cm each are placed in the container. Find to the nearest whole number the new height of water in the container.