Let the number of days be x
He saves $50-$15=$<<50-15=35>>35 each day
After x days he had saved $35*x=$35x
His mom doubled his savings to give $35x*2=$70x
His dad added $10 to give $70x+$10=$500
Subtracting 10 from both sides of the equation formed gives $70x=490
Dividing both sides by $70 give x=7 days
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