If '?' represents multiplication, '?' represents division, '?' represents addition, and '?' represen

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Problem-Solving By Substitution

Interchange Of Signs And Numbers

If '?' represents multiplication, '?' represents division, '?' represents addition, and '?' represents subtraction, what is the value of 4 ? 3 ? 2 ? 5 ? 1?

A. 20

B. 22

C. 18

D. 24

E. None of the above

Answer: C. 18

Following BODMAS, first perform multiplication (4 ? 3 = 12), then division (12 ? 2 = 6), then addition (6 ? 5 = 11), and finally subtraction (11 ? 1 = 10). The correct answer is 10.

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