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Out of 5.5 billion bacteria grown for an experiment, 1 in 75

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Out of 5.5 billion bacteria grown for an experiment, 1 in 75 [#permalink] New post 19 May 2018, 13:57
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Question Stats:

68% (02:32) correct 31% (01:29) wrong based on 48 sessions
Out of 5.5 billion bacteria grown for an experiment, 1 in 75 million has a particular mutation. Approximately how many of the bacteria have the mutation?

(A) 7
(B) 73
(C) 733
(D) 7,333
(E) 73,333
[Reveal] Spoiler: OA

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Re: Out of 5.5 billion bacteria grown for an experiment, 1 in 75 [#permalink] New post 07 Jul 2018, 17:22
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sandy wrote:
Out of 5.5 billion bacteria grown for an experiment, 1 in 75 million has a particular mutation. Approximately how many of the bacteria have the mutation?

(A) 7
(B) 73
(C) 733
(D) 7,333
(E) 73,333


We can create the proportion:

5,500,000,000/n = 75,000,000/1

n = 5,500,000,000/75,000,000 = 5500/75 = about 73

Answer: B
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Re: Out of 5.5 billion bacteria grown for an experiment, 1 in 75 [#permalink] New post 06 Oct 2019, 13:05
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1 billion = 1000 million
5.5 billion = 5500 million
So, ans will be 5500/75 = 73.33 or 73 (after rounding off)
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Re: Out of 5.5 billion bacteria grown for an experiment, 1 in 75 [#permalink] New post 08 May 2020, 02:11
I converted 5.5 bil into 5.5 (10^9) and 75 million into 7.5 (10^7) 5.5/7.5 = .73 and 10^9/10^7 = 100. .73(100) gives us our answer.

Anyone else do this?
Re: Out of 5.5 billion bacteria grown for an experiment, 1 in 75   [#permalink] 08 May 2020, 02:11
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Out of 5.5 billion bacteria grown for an experiment, 1 in 75

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