Question

y varies directly with x. When y = 12, x = 16. Find x when y = 24.

18

32

64

Answer 1

y = cx, where c is a constant
12 = c16
so c = 12/16 = 3/4
y=cx becomes y = 3/4 x
if y = 24, then we have 24 = 3/4x
x= 4/3(24) = 32