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GRE Practice Question-Out of 5.5 billion of bacteria

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Intern
Intern
Joined: 21 Apr 2015
Posts: 9
Followers: 0

Kudos [?]: 2 [0], given: 2

GRE Practice Question-Out of 5.5 billion of bacteria [#permalink] New post 22 Apr 2015, 10:03
00:00

Question Stats:

22% (01:17) correct 77% (00:49) wrong based on 9 sessions
Question:

Out of 5.5 billion of bacteria grown for an experiment, 1 in 75 million has a particular mutation. Approximately how many of these bacteria have the mutation?


(a) 7
(b) 73
(c) 733
(d) 7,333
(e) 73,333

[Reveal] Spoiler:
One good way to keep track of large numbers (especially those that won't fit in the GRE calculator!) is to use scientific notation (or a loose version thereof --- for instance, if 5.5 billion in scientific notation is 5.5 x 10 to the 9th (but it would be equally correct for your purposes to write it as 55 x 10 to the 6th)

5.5 billion = 5,500,000,000 = 5.5 x 10 to the 9th
75 million = 75,000,000 = 75 x 10 to the 6th

Since 1 in 75 mil;of the bacteria have the mutation, divide 5.5 billion by 75 million
answer is (e)
[Reveal] Spoiler: OA
Manager
Manager
Joined: 27 Sep 2017
Posts: 112
Followers: 1

Kudos [?]: 29 [0], given: 4

Re: GRE Practice Question-Out of 5.5 billion of bacteria [#permalink] New post 28 Mar 2018, 01:46
Osira wrote:
Question:

Out of 5.5 billion of bacteria grown for an experiment, 1 in 75 million has a particular mutation. Approximately how many of these bacteria have the mutation?


(a) 7
(b) 73
(c) 733
(d) 7,333
(e) 73,333

[Reveal] Spoiler:
One good way to keep track of large numbers (especially those that won't fit in the GRE calculator!) is to use scientific notation (or a loose version thereof --- for instance, if 5.5 billion in scientific notation is 5.5 x 10 to the 9th (but it would be equally correct for your purposes to write it as 55 x 10 to the 6th)

5.5 billion = 5,500,000,000 = 5.5 x 10 to the 9th
75 million = 75,000,000 = 75 x 10 to the 6th

Since 1 in 75 mil;of the bacteria have the mutation, divide 5.5 billion by 75 million
answer is (e)


the ans should be B, NOT E, check it out, thanks.
Re: GRE Practice Question-Out of 5.5 billion of bacteria   [#permalink] 28 Mar 2018, 01:46
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GRE Practice Question-Out of 5.5 billion of bacteria

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