SOLUTION: A box contains nickels, dimes and pennies worth $8.40. The number of dimes is six less than twice the number of pennies and there is an equal number of dimes and nickels. How many

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Question 327157: A box contains nickels, dimes and pennies worth $8.40. The number of dimes is six less than twice the number of pennies and there is an equal number of dimes and nickels. How many nickels are there in the box?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
P is the number of pennies, N is the number of nickels, D is the number of dimes.
1.D=2P-6
2.D=N=2P-6
3.1P%2B5N%2B10D=840
P%2B5%282P-6%29%2B10%282P-6%29=840
P%2B10P%2B20P-30-60=840
31P=930
highlight%28P=30%29
.
.
.
D=N=2%2830%29-6
highlight%28D=N=54%29