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A school had three streams from standard 1 to standard 4 and two streams from standard 5 to standard 8. In a certain year, the average number of pupils per class was as follows:
Standard 1 to standard 4: 50
Standard 5 to standard 8: 40
Each pupil in the school was given 6 exercise books. The exercise books were delivered to the school in packets each containing a dozen exercise
books. How many packets were delivered to the school?
A. 46
B. 440
C. 480
D. 460