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# Specific question, MGMAT, Fraction

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Intern
Joined: 14 Feb 2014
Posts: 2

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21 Jan 2018, 01:23
Hi All,

I tried to find this question using search but could not find it. Hope you can help me with this! I hope I posted this in the right place.
I am new! So still trying to figure this out:

My question is from MGMAT, FDP guide, FDP strategy section, Problem set, Question 4:

11/30 of 6/20 of 120? (you need to use benchmarks)

> What I did was, 1/3 times 3/10 times 120, cancel zero's to make 1/3 x 3/1 x 12 to make 12?

[1][/3] X [3][/10] X 120, Cancel zero's to make [1][/3] x [3][/1] x 12 = 12?

However the book chose another path and ends up with 13.3. What am I doing wrong??
Math Expert
Joined: 02 Sep 2009
Posts: 49320
Re: Specific question, MGMAT, Fraction  [#permalink]

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21 Jan 2018, 02:20
Moein187 wrote:
Hi All,

I tried to find this question using search but could not find it. Hope you can help me with this! I hope I posted this in the right place.
I am new! So still trying to figure this out:

My question is from MGMAT, FDP guide, FDP strategy section, Problem set, Question 4:

11/30 of 6/20 of 120? (you need to use benchmarks)

> What I did was, 1/3 times 3/10 times 120, cancel zero's to make 1/3 x 3/1 x 12 to make 12?

[1][/3] X [3][/10] X 120, Cancel zero's to make [1][/3] x [3][/1] x 12 = 12?

However the book chose another path and ends up with 13.3. What am I doing wrong??

$$\frac{11}{30} * \frac{6}{20} *120=(\frac{11}{30} *120)* \frac{6}{20}=$$

$$(11*4)*\frac{3}{10}=\frac{132}{10}=13.2$$
_________________
Manhattan Prep Instructor
Joined: 04 Dec 2015
Posts: 596
GMAT 1: 790 Q51 V49
GRE 1: Q170 V170
Re: Specific question, MGMAT, Fraction  [#permalink]

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21 Jan 2018, 12:29
Moein187 wrote:
Hi All,

I tried to find this question using search but could not find it. Hope you can help me with this! I hope I posted this in the right place.
I am new! So still trying to figure this out:

My question is from MGMAT, FDP guide, FDP strategy section, Problem set, Question 4:

11/30 of 6/20 of 120? (you need to use benchmarks)

> What I did was, 1/3 times 3/10 times 120, cancel zero's to make 1/3 x 3/1 x 12 to make 12?

[1][/3] X [3][/10] X 120, Cancel zero's to make [1][/3] x [3][/1] x 12 = 12?

However the book chose another path and ends up with 13.3. What am I doing wrong??

11/30 doesn't equal 1/3. 10/30 is 1/3.
_________________

Chelsey Cooley | Manhattan Prep Instructor | Seattle and Online

My upcoming GMAT trial classes | GMAT blog archive

Re: Specific question, MGMAT, Fraction &nbs [#permalink] 21 Jan 2018, 12:29
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# Specific question, MGMAT, Fraction

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