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Rob is saving to buy a new mp3 player for every $15 he earns babysitting you save $6 on Saturday Rob and $75 babysitting how much money did he save

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SarcasticSeagull
first lets see how many time Rob has made $15 while babysitting
$75 divided by $15 equals 5 
Rob made $15 5 times
every time Rob makes $15, he saves $6
so 
5 * $6 = $30
Rob has saved $30 

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