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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 C 5 A 3 B 2 D 1?

Answer: A. 54
Substituting the symbols and following BODMAS gives the correct result.
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