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Three variables p, q and r are such that p varies directly as q and inversely as the square of r.
(a)When p=9, q=12 and r=2.Find p when q=15 and r=5
(b)Express q in terms of p and r.
(c) If p increased by 20% and r decreased by 10%, find: (i) A simplified expression for the change in q in terms of p and r (ii).The percentage change in q.