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GRE Practice Question-Out of 5.5 billion of bacteria
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22 Apr 2015, 10:03
22 Apr 2015, 10:03
00:00
Question Stats:
20% (01:02) correct
80% (00:50) wrong based on 15 sessions
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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
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
Show: ::
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)
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)
Re: GRE Practice Question-Out of 5.5 billion of bacteria
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28 Mar 2018, 01:46
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
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
Show: ::
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)
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.
