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# M13-21

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Math Expert
Joined: 02 Sep 2009
Posts: 52905

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15 Sep 2014, 23:49
00:00

Difficulty:

15% (low)

Question Stats:

73% (00:30) correct 27% (00:15) wrong based on 115 sessions

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$$\frac{(0.625 * 0.008)}{0.01}$$ = ?

A. 0.005
B. 0.05
C. 0.5
D. 5
E. 50

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Math Expert
Joined: 02 Sep 2009
Posts: 52905

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15 Sep 2014, 23:49
1
Official Solution:

$$\frac{(0.625 * 0.008)}{0.01}$$ = ?

A. 0.005
B. 0.05
C. 0.5
D. 5
E. 50

$$\frac{(0.625 * 0.008)}{0.01} = (\frac{5}{8} * \frac{8}{1000}) * 100 = \frac{500}{1000} = 0.5$$

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Intern
Joined: 11 Aug 2017
Posts: 1

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29 Mar 2018, 07:00
=625*8/10 = 50
Intern
Joined: 31 Jul 2016
Posts: 9

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29 Mar 2018, 07:20
625×10^-3 * 8×10^-3
_____________
1×10^-2

625×8×10^-6×10^2

5000×10^-4

0.5

Sent from my SM-G925I using GMAT Club Forum mobile app
Intern
Joined: 02 Jun 2015
Posts: 23
Location: United States

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05 Apr 2018, 14:24
marknassar wrote:
=625*8/10 = 50

Hi Marknassar,

You're missing the fact that there is a multiplication on the numerator, so there are 6 decimals after the decimal point on the numerator.
This way, you need to move the decimal point in the denominator to 6 decimals as well.

(0.625 x 0.008) / 0.01 = 625 x 8 / 10,000 = 5,000 / 10,000 = 5 / 10 = 0.5

Hope it helps!

Thanks! Ale
Re: M13-21   [#permalink] 05 Apr 2018, 14:24
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# M13-21

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