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# A survey finds that 80 percent of the apartments in City G have smoke

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Math Expert
Joined: 02 Sep 2009
Posts: 55801
A survey finds that 80 percent of the apartments in City G have smoke  [#permalink]

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07 Jan 2019, 04:53
00:00

Difficulty:

15% (low)

Question Stats:

92% (00:53) correct 8% (03:33) wrong based on 15 sessions

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A survey finds that 80 percent of the apartments in City G have smoke alarms installed. Of these, 20 percent have smoke alarms that are not working. What percent of the apartments in City G were found to have working smoke alarms?

A. 60%
B. 64%
C. 66 2/3%
D. 70%
E. 72%

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Joined: 30 Dec 2018
Posts: 34
Re: A survey finds that 80 percent of the apartments in City G have smoke  [#permalink]

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07 Jan 2019, 04:57
80 % of 80%= 64 %

Therefore it's option with 64%

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Concentration: Sustainability, Marketing
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Re: A survey finds that 80 percent of the apartments in City G have smoke  [#permalink]

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07 Jan 2019, 05:01
Bunuel wrote:
A survey finds that 80 percent of the apartments in City G have smoke alarms installed. Of these, 20 percent have smoke alarms that are not working. What percent of the apartments in City G were found to have working smoke alarms?

A. 60%
B. 64%
C. 66 2/3%
D. 70%
E. 72%

let total 100
80 homes have working alarms or say 80*.2 = 16 homes have alarm not working left with 80-16
64
IMO B
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Re: A survey finds that 80 percent of the apartments in City G have smoke   [#permalink] 07 Jan 2019, 05:01
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