Bobosharif S. answered • 03/17/18

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Let d be the number of dimes n number of nickels. Then 10d+5n=525 cents ($5.25) and d=3n. So

10(3n)+5n=525

35n=525

n= 15

d=3n=45

Check: 45*10+15*5=450+75 =525 cents=$5.25