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?
1 answer:
Answer:
$27
Step-by-step explanation:
Set up a proportion where x is the amount of money he saved:
= 
Cross multiply and solve for x:
12x = 324
x = 27
So, he saved $27
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