If m varies directly with p and indirectly with c, and m=100 when p=250 and c=5. Find m when c=10 and p=75.

Question

 This is very confusing how you relate with both direct and indirect variation. I am wondering if there are two answers or one

Answer 1

m varies directly with p and indirectly with c

means

m = kp/c

 

and now use the given data to calculate k, the constant of proportionality.

 

Finally, Find m when c=10 and p=75.