p varies directly as the square of q and inversely as r. ...
p varies directly as the square of q and inversely as r. If p = 36, when q = 36, when q = 3 and r = 4, find p when q = 5 and r = 2
72
100
90
200
125
Correct answer is D
P α q2r
P = kq2r
k = prq2
= 36x4(3)2
p = 16q2r
= 16×252
= 200