GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Out of 5.5 billion bacteria grown for an experiment, 1 in 75
[#permalink]
19 May 2018, 13:57
19 May 2018, 13:57
Expert Reply
00:00
Question Stats:
67% (01:52) correct
33% (01:25) wrong based on 100 sessions
Hide Show timer Statistics
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
(A) 7
(B) 73
(C) 733
(D) 7,333
(E) 73,333
Target Test Prep Representative
Joined: 09 May 2016
Status:Head GRE Instructor
Affiliations: Target Test Prep
Posts: 183
Given Kudos: 114
Location: United States
Re: Out of 5.5 billion bacteria grown for an experiment, 1 in 75
[#permalink]
07 Jul 2018, 17:22
07 Jul 2018, 17:22
3
Expert Reply
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
(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
Re: Out of 5.5 billion bacteria grown for an experiment, 1 in 75
[#permalink]
06 Oct 2019, 13:05
06 Oct 2019, 13:05
1
1 billion = 1000 million
5.5 billion = 5500 million
So, ans will be 5500/75 = 73.33 or 73 (after rounding off)
5.5 billion = 5500 million
So, ans will be 5500/75 = 73.33 or 73 (after rounding off)
