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27 Feb 2017, 05:57
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
93% (01:37) correct
7%
(02:19)
wrong
based on 161
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History
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Time
Result
Not Attempted Yet
At apartment complex Z, 30 percent of the residents are men over the age of 18, and 40 percent are women over the age of 18. If there are 24 children living in the complex, how many total residents live in apartment complex Z?
(A) 32
(B) 80
(C) 94
(D) 112
(E) 124
(A) 32
(B) 80
(C) 94
(D) 112
(E) 124
27 Feb 2017, 06:35
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28 Feb 2017, 14:37
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Hi SajjadAhmad,
There are a couple of different ways to approach this question, but you might find it fastest to TEST THE ANSWERS.
Although the prompt doesn't explicitly state it, we're meant to assume that a 'child' is anyone age 18 or under. The prompt tells us that 30% of the people are adult males and 40% of the people are adult females... which means that the other 30% of the people are 'children.' We're then told that there are 24 total children. We're asked for the TOTAL number of people.
Since 30% of the total = 24, we can either solve algebraically or find the Answer - that when multiplied by 30% - equals 24. The math is fairly straight-forward either way.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
There are a couple of different ways to approach this question, but you might find it fastest to TEST THE ANSWERS.
Although the prompt doesn't explicitly state it, we're meant to assume that a 'child' is anyone age 18 or under. The prompt tells us that 30% of the people are adult males and 40% of the people are adult females... which means that the other 30% of the people are 'children.' We're then told that there are 24 total children. We're asked for the TOTAL number of people.
Since 30% of the total = 24, we can either solve algebraically or find the Answer - that when multiplied by 30% - equals 24. The math is fairly straight-forward either way.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
01 Mar 2017, 18:07
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SajjadAhmad
We can let the total number of residents = n. Thus:
0.3n = total men
0.4n = total women
For this problem, we must assume that a “child” is defined as a person who is age 18 or less. We are given that there are 24 children, so we can create the following equation to determine n:
0.3n + 0.4n + 24 = n
0.7n + 24 = n
24 = 0.3n
240 = 3n
80 = n
Answer: B
