Question 838753
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Hi
n+d+q=42 
he has twice as many dimes as {{{highlight_green(x)}}}nickels
nickels:  x
dimes:  2x
quarters  (42-2x - x)  0r (42-3x)
5n+10d+25q=650  |Yes! CENTS make sense. Good work.
 5x + 10(2x) + 25(42-3x) = 650¢  *** |Solving for x
 5x + 20x + 1050 - 75x = 650
          -50x =  -400
             x = 8, number oF Nickels. 16 Dimes and 18 Quarters (42-24)
CHECKING our answer***
 40 + 160 + 25*18 = 40 + 160 + 450 = 650¢  0r $6.50
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