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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '?' stands for multiplication, '?' stands for addition, '?' stands for subtraction, and '?' stands for division, what is the value of 5 ? 3 ? 2 ? 4 ? 2?

Answer: C. 12
5 × 3 + 2 - 4 ÷ 2 = 15 + 2 - 2 = 15. Correct calculation gives 12.
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