Question

A photograph 5 inches wide by 6 inches high is to be enlarged so that the new height is 20 inches. what will the width of the enlargement be?

Answer 1

The new width is 16.6666666667 inches, which can be rounded to 16.7. 

Width:     5           ?
Height:    6          20

We know that based on the information provided, the new height is 20 inches.

So, in order to solve, you can cross multiply (5 x 20), which would be 100. Then

divide by 6, to get 16.6666666667 or 16.7.