Source: Official Guide for GMAT Review 2016 Problem Solving; #13

3

A rectangular floor that measures 8 meters

A rectangular floor that measures 8 meters by 10 meters is to be covered with carpet squares that each measure 2 meters by 2 meters. If the carpet squares cost $ 12 apiece, what is the total cost for the number of carpet squares needed to cover the floor?

1 Explanation

2

NIKHIL BORKER

One needs to cover a floor having an area of 8mx10m=80 sq m with squares of area 2mx2m=4 sqm

The question basically translates to "How many 4 sqm squares do you need to cover 80 sqm of floor area?"
The answer is 80/4 =20 squares
Now each square costs $12, so the total cost=20x12=$240

Jan 23, 2016 • Comment

Cydney Seigerman, Magoosh Tutor

Thanks for posting your solution! It's good to keep in my that this method works out as both the length and width of the rectangular floor are a multiple of the side length of the square.

Jan 25, 2016 • Reply

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