# SAT Math Multiple Choice Practice Question 19: Answer and Explanation

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**Question: 19**

**19.** Max has 3 hours to study for his tests the next day. He decides to spend k percent of this time studying for math. Which of the following represents the number of minutes he will spend studying for math?

A. k/300

B. 3k/100

C. 100k/180

D. 180k/100

E. 18,000/k

**Correct Answer:** D

**Explanation:**

D. Because the answer should be in minutes, start by turning 3 hours into 180 minutes. You know that k percent of these 180 minutes is going to be used for math. What does k percent mean? Why, it means k/100. Taking a percent of a number involves multiplication, so your answer is 180 × k/100, or 180k/100.