algebra word problem

Question

A girl saved $13.50 in 6 weeks. At that rate, how long will it take her to save $108?

Answer 1

Hi Jeremy

 

The easiest way to solve this is to set up ratios. . . $13.50 in six weeks compared to $108 in X weeks.

 

13.50 / 6 = 108 / X

 

Now cross multiply (top of one fraction times bottom of the other fraction)

 

13.50X = 6 x 108

 

Now multiply the right side.

 

Then divide both sides by 13.50

 

And you'll end up with X = the final answer.

 

Have fun.

 

Dan