ISEE Word Problems Question 174: Answer and Explanation

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Test Information

Question: 174

5. If s = , then which of the following is r in terms of s and t?

  • A. 7st -1
  • B.
  • C.
  • D.

Correct Answer: B

Explanation:

The answer is B

First, multiply both sides by 7: 7s = t(r + 1). Next, divide both sides by t: = r + 1. Now, subtract 1 from both sides: - 1 = r. Finally, create a common denominator by multiplying 1 by to get = r.

Plug in for t and r to solve for s. If t = 2 and r = 3, then = s. Now find the expression that equals 3, using 2 for t and