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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.

  1. When p=9, q12 and r = 2.
    Find p when q= 15 and r =5 
  2. Express q in terms of p and r.

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  1. P=kQ/r2
    9= 12k/22
    k=9/3 =3
    P= 3(15)/25
    P=1.8
     
  2. P=KQ/r2
    (pr2)/3=q
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