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# In a certain neighborhood, 60 percent of the houses have four bedrooms

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Math Expert
Joined: 02 Sep 2009
Posts: 52390
In a certain neighborhood, 60 percent of the houses have four bedrooms  [#permalink]

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10 Apr 2018, 05:52
00:00

Difficulty:

65% (hard)

Question Stats:

63% (02:35) correct 37% (02:47) wrong based on 23 sessions

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In a certain neighborhood, 60 percent of the houses have four bedrooms, and 50 percent of the houses are more than 30 years old. If 75 percent of the houses that are more than 30 years old have four bedrooms, how many of the houses 30 years old or under do not have four bedrooms?

(1) The neighborhood has 80 houses that do not have four bedrooms.
(2) Of the houses having four bedrooms, 25 percent are two-story houses that are more than 30 years old.

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Joined: 24 Jun 2013
Posts: 132
Location: India
Schools: ISB '20
Re: In a certain neighborhood, 60 percent of the houses have four bedrooms  [#permalink]

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11 Apr 2018, 23:44
A IMO,

if we form matrix then all we need is a number that could help us find number of houses , A gives that
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Re: In a certain neighborhood, 60 percent of the houses have four bedrooms &nbs [#permalink] 11 Apr 2018, 23:44
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