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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If P - Q = R, Q + R = S, and S / 2 = T, what is the value of T if P = 15 and Q = 5?

Answer: B. 12.5
Substituting P and Q: R = 15 - 5 = 10; S = 5 + 10 = 15; T = 15 / 2 = 7.5.
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