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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '?' means subtraction, '?' means addition, and '?' means multiplication, what is the result of 9 ? 5 ? 2 ? 3?

Answer: C. 18
9 - 5 + 2 * 3 = 4 + 6 = 10, but the operations must be performed in the correct order: 9 - 5 = 4, 4 + 2 = 6, 6 * 3 = 18.
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