If '?' denotes multiplication, '?' denotes addition, '?' denotes subtraction, and '?' denotes divisi

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Problem-Solving By Substitution

Interchange Of Signs And Numbers

A. 20

B. 25

C. 30

D. 35

E. None of the above

Answer: B. 25

10 × 2 = 20, then 20 ÷ 5 = 4, and finally 4 + 3 = 7.

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