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If the ratio of the number of English books to the number of all other

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If the ratio of the number of English books to the number of all other  [#permalink]

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New post 12 Jul 2018, 00:51
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If the ratio of the number of English books to the number of all other books on a bookshelf is 4 to 1, what percent of the books on the bookshelf are English books?

(A) 20%
(B) 25%
(C) 50%
(D) 75%
(E) 80%

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Re: If the ratio of the number of English books to the number of all other  [#permalink]

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New post 12 Jul 2018, 01:04
Bunuel wrote:
If the ratio of the number of English books to the number of all other books on a bookshelf is 4 to 1, what percent of the books on the bookshelf are English books?

(A) 20%
(B) 25%
(C) 50%
(D) 75%
(E) 80%



English:others = \(4:1=4x:x\)
so total = \(4x+x=5x\)

% of English books = \(\frac{4x}{5x}*100=80%\)
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Re: If the ratio of the number of English books to the number of all other  [#permalink]

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New post 12 Jul 2018, 05:37
Bunuel wrote:
If the ratio of the number of English books to the number of all other books on a bookshelf is 4 to 1, what percent of the books on the bookshelf are English books?

(A) 20%
(B) 25%
(C) 50%
(D) 75%
(E) 80%



let assume the total no of books be 5

English = 4
Other book = 1

Required % = (4 / 5)*100
= 80%

Thus the best answer is E.
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Re: If the ratio of the number of English books to the number of all other  [#permalink]

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New post 12 Jul 2018, 08:15
Bunuel wrote:
If the ratio of the number of English books to the number of all other books on a bookshelf is 4 to 1, what percent of the books on the bookshelf are English books?

(A) 20%
(B) 25%
(C) 50%
(D) 75%
(E) 80%

\(\frac{4}{5}*100 = 80%\)
Answer will be (E)
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Re: If the ratio of the number of English books to the number of all other  [#permalink]

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New post 12 Jul 2018, 10:00
There are 4 parts of english books for a total of 5 parts of books. Proportion is then 4/5 = 80%.
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Re: If the ratio of the number of English books to the number of all other &nbs [#permalink] 12 Jul 2018, 10:00
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