SAT Math Multiple Choice Question 84: Answer and Explanation

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Question: 84

9. t + 4 = t - 5

In the equation above, what is the value of t ?

  • A. 4
  • B. 9
  • C. 18
  • D. 36

Correct Answer: D

Explanation:

D Use a calculator to translate the fractions into decimals. t + 4 = t - 5 becomes 0.5t + 4 = 0.75t - 5. Subtract 0.5t from both sides to get 4 = 0.25t - 5, and then add 5 to both sides. This results in 9 = 0.25t. Use a calculator to divide! t = 36; therefore, the correct answer is (D).

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