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22 Oct 2017, 06:10
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D
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:
86% (01:07) correct
14%
(01:11)
wrong
based on 135
sessions
History
Date
Time
Result
Not Attempted Yet
For every novel in the school library there are 2 science books; for each science book there are 7 economics books. Express the ratio of economics books to science books to novels in the school library as a triple ratio.
(A) 7 : 2 : 1
(B) 7 : 1 : 2
(C) 14 : 7 : 2
(D) 14 : 2 : 1
(E) 14 : 2 : 7
(A) 7 : 2 : 1
(B) 7 : 1 : 2
(C) 14 : 7 : 2
(D) 14 : 2 : 1
(E) 14 : 2 : 7
22 Oct 2017, 07:12
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Bunuel
\(S=2N => S:N=2:1\)
\(E=7S => E:S=7:1\) or \(E:S=14:2\) (to make \(S\) equivalent to \(2\) to compare it with the ratio \(S:N\))
So \(E:S:N = 14:2:1\)
Option D
22 Oct 2017, 07:31
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Lets shorten everything
Science books: S
Novels: N
Economics: E
From the question
N:S = 1:2
S:E = 1:7
E:S:N?
If there is one N, 2 S are there too
So for 2 S, 14 E are there.
So
Ans: 14:2:1 (D)
Science books: S
Novels: N
Economics: E
From the question
N:S = 1:2
S:E = 1:7
E:S:N?
If there is one N, 2 S are there too
So for 2 S, 14 E are there.
So
Ans: 14:2:1 (D)
