I have been thoroughly defeated by this problem from my seven-year-old's math practice homework:
Sharla has 12 coins. She has 70¢. How many pennies, dimes, and nickels does she have?
We worked on this together for five or ten minutes, then I worked on it for five minutes more. I tried all sorts of different combinations — nothing fit! I give up — I'm sending it in with a note for the teacher, in the hope that she'll return the answer.
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