Question

Rob is saving to buy a new MP3 player. For every $12 he earns babysitting, he saves $9. On Saturday, Rob earned $36 babysitting. How much money did he save?

Answer 1

$27

Explanation:

Set up a proportion where x is the amount of money he saved:

`(12)/(9)` =
`(36)/(x)`

Cross multiply and solve for x:

12x = 324

x = 27

So, he saved $27