Question

y varies jointly with p and q. When p = 10 and q = 2, y = 60. Find y when p = 5 and q = 5.

Answer 1

y = kpq where k is a constant
plug in y=60.p=10 and q=2 to find k
then you can use this for last part of your question.

Answer 2

i dont get it

Answer 3

y = kpq = k*p*q
60 = k *10*2

do u get that?