Question 997434
q+n= 82. Subtract n on both sides of the equal sign and we have:
q= 82-n
0.25q+0.10n= 13.30 Now, in this formula, substitute the value of q:
0.25(82-n)+0.10n= 13.30
20.50-0.25n+0.10n= 13.30 Add n on left and subtract 20.50 on both sides
-0.15n= -7.20 Now divide both sides by -0.15
n= -7.20/-0.15 OK, remember that -/- = +:
n= 48 They have 48 nickels and: 
82-48= 34quarters.
Proof:
48*0.10= 4.80
34*0.25= 8.50
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Total.....13.30 We have the correct answer