SAT Math Multiple Choice Practice Question 120: Answer and Explanation

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Question: 120

10. The price of a certain train ticket is directly proportional to the number of miles traveled. If a ten-mile trip costs $3.75, then a 24-mile trip would cost

A. $6.15
B. $9.00
C. $10.50
D. $15.00
E. $17.75

Correct Answer: B


B. Because the two numbers are directly proportional, you can set up a proportion:

. Doing that wacky cross-multiplying thing gives you 10x = 90, so x = $9.00. (For more information on proportions, check out Chapter 12.)

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