Question

Suppose y varies directly with x, and y = 60 when x = 12. What is y when x is 20?

Answer 1

Explanation:

y = kx, where k is a real constant.

When x = 12, y = 60.

=> (60) = (12)k, k = 5.

Therefore when x = 20,

y = kx = (5)(20) = 100.