PSAT Math Multiple-Choice Question 774: Answer and Explanation

Question: 774

A roller coaster requires riders to be at least 48 inches tall. Given that there are approximately 2.54 centimeters in an inch, how tall must a rider be to the nearest whole centimeter to ride the roller coaster?

• A. 96
• B. 122
• C. 148
• D. 190

Correct Answer: B

Explanation:

(B) You can use the conversion given in the problem (2.54 centimeters per 1 inch) to cancel out the units you don't want (inches), leaving you with only the units that you do want (centimeters):

Choice (B) is the correct answer.