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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If '+' means 'subtract', '-' means 'add', '×' means 'divide', and '÷' means 'multiply', what is the result of 9 + 3 - 2 × 4 ÷ 2?

Answer: B. 12
9 - 3 + 2 ÷ 4 × 2 = 6 + 1 = 7, which is incorrect. Re-evaluate the operations.
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