SAT Math Multiple Choice Practice Question 75: Answer and Explanation

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Question: 75

9. On a number line, four evenly spaced marks are placed between -2 and 13. What is the coordinate of the second such mark?

A. 1
B. 4
C. 5.5
D. 7
E. 7.5

Correct Answer: B


B. Here's the number line for you:

Notice that you have four marks but five spaces (one between each pair of marks, including 13 and -2). The distance between the endpoints is 13 - (-2) = 15. Thus, each of the five spaces is three units wide. So from left to right, the four marks are at 1, 4, 7, and 10.

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