If the values of s and t are directly proportional and s =8 when t =10, what is the value of s when t = 15?

1 Answer
Jan 18, 2017

When t= 15, s = 12.

Explanation:

If s and t are directly proportional, then t = cs for a real constant c.

10 = 8c => c = 10/8 = 5/4

This means when t=15, 15 = 5/4s => s = 15 * 4/5 = 60/5 = 12.

For this problem, we had to remember that a / (b/c) = a * c/b.