Let c be the total number of pieces of cake. Let m be the number of pieces Mindy ate. Let t be the number of pieces Troy ate. We have the following given equations:
- m + t = 9
- m = 3
- t = 1/4c
3 + 1/4c = 9
Subtract 3 from each side:
1/4c = 6
Cross multiply:
c = 24
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