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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '?' stands for addition, '?' stands for subtraction, '?' stands for multiplication, and '?' stands for division, what is the value of 15 ? 3 ? 2 ? 4?

Answer: C. 14
15 ÷ 3 = 5, then 5 × 2 = 10, and finally 10 + 4 = 14.
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