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31 May 2019, 09:28
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A
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Difficulty:
95%
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Question Stats:
27% (02:10) correct
73%
(02:30)
wrong
based on 200
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There are 6 floors in an apartment building. The mean number of residents in each apartment in the building is 2.3. How many apartments are in the building?
(1) On each floor, the number of apartments is between 2 and 4 inclusive.
(2) The total number of residents in the block is greater than 40
(1) On each floor, the number of apartments is between 2 and 4 inclusive.
(2) The total number of residents in the block is greater than 40
01 Jun 2019, 07:33
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If we have 2.3 people per apartment, the ratio of people to apartments is 2.3 to 1, or 23 to 10. That's a reduced ratio, and our quantities must be integers, so the number of people must be a multiple of 23, and the number of apartments must be a multiple of 10.
From Statement 1, we have between 12 and 24 apartments. The only multiple of 10 in that range is 20, so we must have 20 apartments and 46 people.
Statement 2 is not sufficient, since we could have any number of residents greater than 40 that is a multiple of 23, so the answer is A.
From Statement 1, we have between 12 and 24 apartments. The only multiple of 10 in that range is 20, so we must have 20 apartments and 46 people.
Statement 2 is not sufficient, since we could have any number of residents greater than 40 that is a multiple of 23, so the answer is A.
General Discussion
31 May 2019, 12:48
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shridhar786
There are 6 floors in an apartment building. The mean number of residents in each apartment in the building is 2.3. How many apartments are in the building?
(1) On each floor, the number of apartments is between 2 and 4 inclusive.
(2) The total number of residents in the block is greater than 40
WTH IS WRONG WITH YOUR POSTS, MAN.(1) On each floor, the number of apartments is between 2 and 4 inclusive.
(2) The total number of residents in the block is greater than 40
IT SAYS THERE ARE 2,3,4 APARTMENTS THERE
I TRIED SEVERAL POSSIBLE COMBINATIONS.
THE ULTIMATE EQUATION REMAINS
6X(2,3,4)/2.3
