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Problem-Solving By Substitution
Interchange Of Signs And Numbers

In a system where '*' represents multiplication, '/' represents division, '+' represents addition, and '-' represents subtraction, what is the outcome of 12 * 3 / 4 + 2 - 1?

Answer: B. 11
12 × 3 = 36, then 36 ÷ 4 = 9, and finally 9 + 2 - 1 = 10.
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