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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
Joined: 16 Aug 2015
Posts: 6361
GMAT 1: 760 Q51 V42
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There are a lot of houses such that the numbers of their doorplates ar  [#permalink]

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22 May 2016, 17:49
00:00

Difficulty:

15% (low)

Question Stats:

85% (00:48) correct 15% (01:50) wrong based on 28 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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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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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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