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# In a poll of 44,000 dentists, only 30 percent responded; of these, 20

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Math Expert
Joined: 02 Sep 2009
Posts: 51281
In a poll of 44,000 dentists, only 30 percent responded; of these, 20  [#permalink]

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01 Aug 2018, 23:38
00:00

Difficulty:

15% (low)

Question Stats:

86% (01:22) correct 14% (01:52) wrong based on 37 sessions

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In a poll of 44,000 dentists, only 30 percent responded; of these, 20 percent claimed to prefer Toothpaste A. How many of the dentists who responded did not claim a preference for Toothpaste A?

A. 2,200
B. 2,640
C. 6,160
D. 8,800
E. 10,560

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Re: In a poll of 44,000 dentists, only 30 percent responded; of these, 20  [#permalink]

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01 Aug 2018, 23:50
Bunuel wrote:
In a poll of 44,000 dentists, only 30 percent responded; of these, 20 percent claimed to prefer Toothpaste A. How many of the dentists who responded did not claim a preference for Toothpaste A?

A. 2,200
B. 2,640
C. 6,160
D. 8,800
E. 10,560

No of respondents = 44000 * 0.3 = 13200

No of dentists who don't prefer toothpaste A = 13200 * 0.8 = 10560

Intern
Joined: 30 May 2018
Posts: 9
Re: In a poll of 44,000 dentists, only 30 percent responded; of these, 20  [#permalink]

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02 Aug 2018, 00:20
44000*0.3*(1-0.2) = 13200*0.8 = 10560

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Concentration: Operations, Marketing
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Re: In a poll of 44,000 dentists, only 30 percent responded; of these, 20  [#permalink]

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02 Aug 2018, 01:11
Bunuel wrote:
In a poll of 44,000 dentists, only 30 percent responded; of these, 20 percent claimed to prefer Toothpaste A. How many of the dentists who responded did not claim a preference for Toothpaste A?

% that claimed for toothpaste = 20%
% that did not claim for toothpaste = 80%

Total number that did not claim for toothpaste = 44000 * 0.30 * 0.80 = 10560

Hence, E.
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Re: In a poll of 44,000 dentists, only 30 percent responded; of these, 20 &nbs [#permalink] 02 Aug 2018, 01:11
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