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There are a lot of houses such that the numbers of their doorplates ar

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Math Revolution GMAT Instructor
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There are a lot of houses such that the numbers of their doorplates ar  [#permalink]

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New post 22 May 2016, 17:49
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A
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Difficulty:

  15% (low)

Question Stats:

88% (00:37) correct 12% (01:31) wrong based on 25 sessions

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There are a lot of houses such that the numbers of their doorplates are odd numbers and the first number of the doorplates is 545, the last number of the doorplates is 705. How many houses are there?

A. 61
B. 71
C. 81
D. 91
E. 101

* An answer will be posted in two days.

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Re: There are a lot of houses such that the numbers of their doorplates ar  [#permalink]

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New post 22 May 2016, 20:17
MathRevolution wrote:
There are a lot of houses such that the numbers of their doorplates are odd numbers and the first number of the doorplates is 545, the last number of the doorplates is 705. How many houses are there?

A. 61
B. 71
C. 81
D. 91
E. 101

* An answer will be posted in two days.



Hi,
the numbers from 546 to 705 will have equal EVEN and ODD numbers.. and 545 will make one ODD extra..
# of ODDs =\(\frac{705-545}{2} + 1 = 80+1=81\)......C
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3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: There are a lot of houses such that the numbers of their doorplates ar  [#permalink]

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New post 29 Jul 2018, 22:27
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Re: There are a lot of houses such that the numbers of their doorplates ar &nbs [#permalink] 29 Jul 2018, 22:27
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