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# A group of buildings is numbered using all the even numbers between 41

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Re: A group of buildings is numbered using all the even numbers between 41 [#permalink]
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Bunuel wrote:
A group of buildings is numbered using all the even numbers between 412 and 680 inclusive, How many buildings are in the group ?

A. 134
B.135
C. 137
D. 139
E. 143

I prefer to solve such a problem without learning any formula so he is my 1 cent

Total Even Numbers from 1 to 680 = 680/2 = 340

We have to exclude all even numbers which are from 1 to 410 (because we need 412 to be included) from these 340 numbers

Total Even Numbers from 1 to 410 = 410/2 = 205

So All even numbers from 412 to 680 inclusive = 340 - 205 = 135

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Re: A group of buildings is numbered using all the even numbers between 41 [#permalink]
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Re: A group of buildings is numbered using all the even numbers between 41 [#permalink]
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