PSAT Math Multiple-Choice Question 379: Answer and Explanation

Question: 379

Luca is from a country that uses the metric system and is visiting his cousin Drew in the United States, which uses the standard, or English, system. He gives Drew a family recipe for bread. The recipe is for one loaf and calls for 180 milliliters of milk. Drew wants to make five loaves. If 1 U.S. cup equals 236.588 milliliters,
approximately how many cups of milk will Drew need?

• A.
• B.
• C.
• D.

Correct Answer: C

Explanation:

C

Difficulty: Easy

Category: Unit Conversion

Getting to the Answer: Break the question into short steps and solve each step, checking units as you go. First, find the total number of milliliters (mL) of milk Drew will need for 5 loaves:

Second, convert the total number of milliliters needed to cups:

Drew will need about 3.8 or cups of milk, (C). Note that estimating 900 divided by 236 as a little less than 4 is sufficient for answering this question without the use of a calculator, based on the answer choices.