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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '?' represents addition, '?' represents subtraction, '×' represents multiplication, and '÷' represents division, which of the following is correct? 6 ? 2 × 3 ? 4?

Answer: A. 10
Calculating 6 + 2 = 8, then 8 × 3 = 24, and finally 24 - 4 = 20.
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