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A company assembles two kinds of phones: feature and smartphone. Of th

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A company assembles two kinds of phones: feature and smartphone. Of th  [#permalink]

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New post 25 Sep 2018, 05:04
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A company assembles two kinds of phones: feature and smartphone. Of the phones produced by the company last year, (2/5)th were feature phones and the rest were smartphones. If it takes (8/5)th as many hours to produce a smartphone as it does to produce a feature phone, then the number of hours it took to produce the smartphones last year was what fraction of the total number of hours it took to produce all the phones?


(A) 8/31

(B) 11/31

(C) 12/17

(D) 13/34

(E) 15/34

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Re: A company assembles two kinds of phones: feature and smartphone. Of th  [#permalink]

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New post 27 Sep 2018, 07:59
\(\frac{2}{5}\)\(F\) and \(\frac{3}{5}\)\(S\)

It takes \(\frac{8}{5}\) longer to produce S.

Lets say 100 phones were produced in total and it takes 1hour to produce a feature (F) phone.

Feature: \(\frac{2}{5}\)\(*100\)=\(40\)
Smartphone: \(\frac{3}{5}\)\(*100\)=\(60\)

Total Hours: \(40+\)\(\frac{8}{5}\)\(*60\)=\(40+96\)=\(136\)

\(\frac{96}{136}\)--> \(\frac{12}{17}\)

Hence, C
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Re: A company assembles two kinds of phones: feature and smartphone. Of th &nbs [#permalink] 27 Sep 2018, 07:59
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