SOLUTION: A stack of pennies and dimes has a total value of $2.31. How many dimes are in the stack if there are twice as many dimes as pennies?

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Question 342344: A stack of pennies and dimes has a total value of $2.31. How many dimes are in the stack if there are twice as many dimes as pennies?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let D be the number of dimes, P the number of pennies.
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.
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D=2P
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.
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10D%2BP=231
10%282P%29%2BP=231
20P%2BP=231
21P=231
highlight%28P=11%29
Then from the first equation,
D=2%2811%29
highlight%28D=22%29