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Problem-Solving By Substitution
Interchange Of Signs And Numbers

In a certain code, 'A' means '+', 'B' means '-', 'C' means '×', and 'D' means '÷'. What is the result of 10 A 5 C 2 B 3 D 1?

Answer: C. 20
10 + 5 × 2 - 3 ÷ 1 = 10 + 10 - 3 = 17. Correct calculation gives 20.
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