If 8 boxes of tissue cost $10.00, how much will 15 boxes of tissue cost?

Question

Solve the problem 

Answer 1

This is a proportion problem

 

$10.00 : 8 :: x : 15

 

10/8 = x /15

 

15 * 10 / 8 = x

 

150 / 8 = x

 

So x = $18.75