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E
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Difficulty:
5%
(low)
Question Stats:
81% (00:56) correct
19%
(01:05)
wrong
based on 1362
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In a certain population, there are 3 times as many people aged twenty-one or under as there are people over twenty-one. The ratio of those twenty-one or under to the total population is
(A) 1 to 2
(B) 1 to 3
(C) 1 to 4
(D) 2 to 3
(E) 3 to 4
(A) 1 to 2
(B) 1 to 3
(C) 1 to 4
(D) 2 to 3
(E) 3 to 4
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05 May 2010, 14:25
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just plug in #s
say there are 6 people aged under 21. Thus there will be 2 people over 21 so a total of 8 people. And we are asked what proportion under 21 (6) is to total (8)
6/8=3/4 =E
Additionally same exact approach 3X/3X+1X = 3/4
say there are 6 people aged under 21. Thus there will be 2 people over 21 so a total of 8 people. And we are asked what proportion under 21 (6) is to total (8)
6/8=3/4 =E
Additionally same exact approach 3X/3X+1X = 3/4
General Discussion
05 May 2010, 22:28
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Consider the ratio of the under population of 21 to over the 21 as 3:1
therefore 3x:1X
Now the ratio of the under to the whole population becomes 3x/3x+1x
= 3/4
Answer is E)
therefore 3x:1X
Now the ratio of the under to the whole population becomes 3x/3x+1x
= 3/4
Answer is E)
