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# 79 laboratories raise the bacterium, the laboratory have 48 culture di

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8009
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79 laboratories raise the bacterium, the laboratory have 48 culture di  [#permalink]

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08 Mar 2016, 17:09
00:00

Difficulty:

45% (medium)

Question Stats:

64% (01:30) correct 36% (01:49) wrong based on 170 sessions

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79 laboratories raise the bacterium, the laboratory have 48 culture dishes on average, which has about 25,075 bacteria each. How many bacteria are there approximately?

A. 10^7
B. 10^8
C. 10^9
D. 10^10
E. 10^11

* A solution will be posted in two days.

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"Only $79 for 1 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Marshall & McDonough Moderator Joined: 13 Apr 2015 Posts: 1685 Location: India Re: 79 laboratories raise the bacterium, the laboratory have 48 culture di [#permalink] ### Show Tags 08 Mar 2016, 18:10 1 1 lab = 48 culture dishes = $$4 * 12$$ 1 culture = $$25 * 10^3$$ bacteria 79 labs = $$80 * 4 * 12 * 25 * 10^3$$ = $$12 * 8 * 10^6$$ = $$96 * 10^6$$ = $$10^8$$ approx. Answer: B GMAT Club Legend Joined: 12 Sep 2015 Posts: 4007 Location: Canada Re: 79 laboratories raise the bacterium, the laboratory have 48 culture di [#permalink] ### Show Tags 08 Mar 2016, 21:00 MathRevolution wrote: 79 laboratories raise the bacterium, the laboratory have 48 culture dishes on average, which has about 25,075 bacteria each. How many bacteria are there approximately? A. 10^7 B. 10^8 C. 10^9 D. 10^10 E. 10^11 So, we want to find the approximate value of (25,075)(48)(79) Here's how I would do this. First deal with (25,075)(48) 25,075 is very close to 25,000, so let's go with that. Now, (25,000)(4) = 100,000, so (25,000)(40) = 1,000,000, which means (25,000)(48) is a BIT BIGGER than 1,000,000, which I will denote as 1,000,000+ So, (25,075)(48)(79) ≈ (1,000,000+)(79) ≈ 80,000,000+ ≈ 100,000,000 ≈ 10^8 [I know this because 100,000,00 has 8 zeros] Answer: B Cheers, Brent _________________ Test confidently with gmatprepnow.com Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 8009 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: 79 laboratories raise the bacterium, the laboratory have 48 culture di [#permalink] ### Show Tags 12 Mar 2016, 06:28 79 laboratories raise the bacterium, the laboratory have 48 culture dishes on average, which has about 25,075 bacteria each. How many bacteria are there approximately? A. 10^7 B. 10^8 C. 10^9 D. 10^10 E. 10^11 -> Due to approximately, 79=80, 48=50, 25,075=25,000 are derived, which makes (79)(48)(25,075)=(80)(50)(25,000)=10^8. The answer is B. _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$79 for 1 month Online Course"
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Re: 79 laboratories raise the bacterium, the laboratory have 48 culture di  [#permalink]

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13 Mar 2016, 07:12
MathRevolution wrote:
79 laboratories raise the bacterium, the laboratory have 48 culture dishes on average, which has about 25,075 bacteria each. How many bacteria are there approximately?

A. 10^7
B. 10^8
C. 10^9
D. 10^10
E. 10^11

* A solution will be posted in two days.

We've to find approx value.
80*50*25000 = 10^8
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Re: 79 laboratories raise the bacterium, the laboratory have 48 culture di  [#permalink]

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05 Oct 2017, 06:31
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Re: 79 laboratories raise the bacterium, the laboratory have 48 culture di   [#permalink] 05 Oct 2017, 06:31
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# 79 laboratories raise the bacterium, the laboratory have 48 culture di

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