Question

A rectangular field has a length of 105 feet and a width of 60 feet. On a map of the field, the width was drawn as 4 inches. What measurements should represent the length?

Answer 1

Compare by writing: 
$\frac{105}{60} = \frac{x}{4}$

You can get 60 to 4 by dividing by 15, so you need to do the same with 105. 105/15 is 7.