kaplan #9

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magical cook: Master | Next Rank: 500 Posts; Posts: 484; Joined: Sun Jul 30, 2006 7:01 pmFollowed by: 1 member; Thanked: 2 times

by magical cook » Wed Aug 22, 2007 5:13 pm

9) The average (arithmetic mean) of 3a + 4 and another number is 2a. What is the average of the other number and a?

1) 2a
2) a-4
3) a-2
4) a+2
5) a+4

Can anyone help? Correct answer will follow.

thanks

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Source: Beat The GMAT — Problem Solving | Wed Aug 22, 2007 5:13 pm

ratindasgupta: Senior | Next Rank: 100 Posts; Posts: 98; Joined: Mon Jun 11, 2007 10:32 pm; Location: Mumbai

by ratindasgupta » Wed Aug 22, 2007 9:52 pm

Let the other number be x.

x + (3a + 4) = 4a

so x = a - 4

So average of (a - 4) and a = (2a - 4)/2 = a - 2

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