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(0.0036)(2.8) / (0.04)(0.1)(0.003) =

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(0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 07 Dec 2012, 02:52
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Question Stats:

64% (02:16) correct 36% (01:23) wrong based on 502 sessions
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084
[Reveal] Spoiler: OA
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Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 07 Dec 2012, 02:58
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Walkabout wrote:
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084


\frac{0.0036*2.8}{0.04*0.1*0.003}=\frac{(36*10^{-4})*(28*10^{-1})}{(4*10^{-2})(1*10^{-1})*(3*10^{-3})}=\frac{36*28*10^{(-4-1)}}{4*3*10^{(-2-1-3)}}=84*10=840.

Answer: A.
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Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 13 Jun 2013, 01:40
While reading the problem, I re-wrote in the following way:
36/100000 * 28/10 * 100 / 4 * 10/1 * 1000/3
Simplifying further, Answer = A = 840
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Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 29 Oct 2013, 15:13
I calculated the power of 10.
It was 10^5 / 10^-6.
Hence the ans. will end with 10^1. Its only A.
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(0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 25 Aug 2014, 06:25
With questions like this, take a look at the answers first. Notice the only distinction between the answers is the factor of ten; thus, an exact calculation is not necessary to solve the problem, just a quick approximation.

.0036*2.8 is ~.0036*3, which can be approximated to .01.

.04*.1 = .004

Thus we have (.01)/(.004*.003). We can cancel out the powers of ten to give us 1/(.4*.003), which is 1/(.0012).

.0012 in fraction form is 12/10,000. Thus, our answer is can be given as 10,000/12.

840 is the only answer that comes close. Answer:A

Using the approximation method you can easily solve this question in 1:30 - 2:00.
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Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 11 Sep 2014, 05:31
Walkabout wrote:
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084




36(28)*10^-5 / 12 * 10^-6


84 /10^-1 = 840
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Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 23 Sep 2014, 10:09
I think there is mistake in the last part of the solution.
84 /10^-1 = 840 . This should be 8.4 not 840.
84/10^1 = 840.

Let me know if my understanding is correct.
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Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 23 Sep 2014, 23:49
preetnyc wrote:
I think there is mistake in the last part of the solution.
84 /10^-1 = 840 . This should be 8.4 not 840.
84/10^1 = 840.

Let me know if my understanding is correct.



1/10^-1 = 10.. (the way i used power without symbol might create problem)

check below url..

Reciprocal in http://gmatclub.com/forum/math-number-theory-88376.html
Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) =   [#permalink] 23 Sep 2014, 23:49
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