the average

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Mon Mar 26, 2012 12:57 am

What is the average of 7x and 91y?
(1) x + 13y = 100.
(2) x + y = 88.

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Source: Beat The GMAT — Data Sufficiency | Mon Mar 26, 2012 12:57 am

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Mon Mar 26, 2012 1:24 am

sanju09 wrote:What is the average of 7x and 91y?
(1) x + 13y = 100.
(2) x + y = 88.

(1) x + 13y = 100
So, (7x + 91y)/2 = 7(x + 13y)/2 = 7* 100/2 = 350; SUFFICIENT.

(2) x + y = 88 but we cannot find the value of (7x + 91y)/2 from this; NOT sufficient.

The correct answer is A.

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