Question 530015

Let
He has = x quarters
He has = 2x nickels


Total Amount = $3.50 or 3.50*100 = 350 cents


x*25+2x*5=350
25x+10x=350
35x=350
35x/35=350/35
x=10


He has = x  = 10 quarters 
He has = 2x = 2*10 = 20 nickels


Check
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10*25 + 5*20 = 350
250+100=350
350=350