PSAT Math Multiple-Choice Question 356: Answer and Explanation

Question: 356

A homeowner wants to buy 81 square feet of grass for his yard, but the vendor he uses sells grass only by the square yard. How many square yards of grass does the homeowner need? (1 yard = 3 feet)

• A. 9
• B. 27
• C. 243
• D. 729

Correct Answer: A

Explanation:

A

Difficulty: Easy

Category: Unit Conversion

Getting to the Answer: Map out your route from starting units to end units, being mindful of the fact that the question deals with units of area (square units). The starting quantity is in square feet, and the desired quantity is in square yards. The only conversion factor you need is 3 feet (ft) = 1 yard (yd). Setting up your route to square yards, you get:

This matches (A).