One inch represents 20 miles on Map K and one inch

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BTGModeratorVI: Legendary Member; Posts: 1223; Joined: Sat Feb 15, 2020 2:23 pm; Followed by:1 members

One inch represents 20 miles on Map K and one inch

by BTGModeratorVI » Thu May 07, 2020 5:54 am

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One inch represents 20 miles on Map K and one inch represents 30 miles on Map L. An area of 3 square inches represents how many more square miles on Map L than on Map K ?

A. 30
B. 400
C. 500
D. 900
E. 1,500

Answer: E
Source: Official guide 2021

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Source: Beat The GMAT — Problem Solving | Thu May 07, 2020 5:54 am

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8086; Joined: Sat Apr 25, 2015 10:56 am; Location: Los Angeles, CA; Thanked: 43 times; Followed by:29 members

Re: One inch represents 20 miles on Map K and one inch

by Scott@TargetTestPrep » Sun May 10, 2020 11:45 am

BTGModeratorVI wrote: ↑
Thu May 07, 2020 5:54 am
One inch represents 20 miles on Map K and one inch represents 30 miles on Map L. An area of 3 square inches represents how many more square miles on Map L than on Map K ?

A. 30
B. 400
C. 500
D. 900
E. 1,500

Answer: E
Source: Official guide 2021

On Map K, since 1 inch = 20 miles, then 1 in^2 = 400 mi^2, and 3 in^2 = 1200 mi^2.

On Map L, since 1 inch = 30 miles, then 1 in^2 = 900 mi^2, and 3 in^2 = 2700 mi^2.

Thus, the difference is 2700 - 1200 = 1500 mi^2.

Answer: E

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