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If x is equal to the sum of even integers from 40 to 60,

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If x is equal to the sum of even integers from 40 to 60, [#permalink] New post 29 May 2006, 05:14
If x is equal to the sum of even integers from 40 to 60, inclusive, and y is the number of even integers from 40 to 60, inclusive, what is the value of x + y

(a) 550
(b) 551
(c) 560
(d) 561
(e) 572

I got this question wrong and just cant figure why. My answer was (b).
GMAT Prep tells me that its (d)
Let me know what u guys find
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Manager
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 [#permalink] New post 29 May 2006, 05:30
There are 21 integers from 40 to 60 (inclusive). Of these, 11 are even (=y), and their mean is 50. 50*11 = 550 = x. So x+y = 550+11=561, the correct answer is d).
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 [#permalink] New post 29 May 2006, 06:00
Average value - (40 + 60)/2 = 50

Number of intergers between 40 and 60 (inclusive) = 60 - 40 + 1 = 21

Since we are counting even integers with 40 inclusive there are 11 even integers...

so the total is 50 * 11 + 11 = 561
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 [#permalink] New post 29 May 2006, 10:58
Definitely D - 561. OA is wrong? :?
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 [#permalink] New post 03 Jun 2006, 13:47
I got D brute force style
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 [#permalink] New post 04 Jun 2006, 17:53
Got this before..
Another D
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 [#permalink] New post 06 Jun 2006, 07:00
ahahha I got this wrong as well...I reviewed my calcs on the piece of paper and it was ridiculous: 550+11=551!!!
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  [#permalink] 06 Jun 2006, 07:00
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