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Rectangular Floors X and Y have equal

Rectangular Floors X and Y have equal area. If Floor X is 12 feet by 18 feet and Floor Y is 9 feet wide, what is the length of Floor Y, in feet?

2 Explanations

3

Another approach would be the "doubling and halving technique", explained here: http://gmat.magoosh.com/lessons/311-doubling-and-halving

D&H technique: A·B = (A/2) · 2B

Since 18 · 12 = 9 · L
(9 · 2) · 12 = 9 · (12 · 2)

Since 12 · 2 = 24, correct answer is 24 (E).

Jan 24, 2015 • Comment

5

Gravatar Mike McGarry, Magoosh Tutor

Dec 26, 2013 • Comment

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