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# The ratio of two quantities is 5 to 6. If each of the quantities is in

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Math Expert
Joined: 02 Sep 2009
Posts: 50058
The ratio of two quantities is 5 to 6. If each of the quantities is in  [#permalink]

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21 Aug 2016, 04:18
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15% (low)

Question Stats:

73% (00:56) correct 27% (01:19) wrong based on 101 sessions

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The ratio of two quantities is 5 to 6. If each of the quantities is increased by 15, what is the ratio of these 2 new quantities?

A. 5:6
B. 25:27
C. 15:16
D. 20:21
E. It cannot be determined from the information given

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Joined: 02 Aug 2009
Posts: 6983
Re: The ratio of two quantities is 5 to 6. If each of the quantities is in  [#permalink]

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21 Aug 2016, 04:30
1
Bunuel wrote:
The ratio of two quantities is 5 to 6. If each of the quantities is increased by 15, what is the ratio of these 2 new quantities?

A. 5:6
B. 25:27
C. 15:16
D. 20:21
E. It cannot be determined from the information given

Hi,
The ratio cannot be straight way added any quantity...
5:6 means 5x:6x...
So when you add a quantity, it becomes 5x + 15 : 6x +15..
So value of x is must..

Ans E
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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Re: The ratio of two quantities is 5 to 6. If each of the quantities is in  [#permalink]

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23 Aug 2016, 09:07
Bunuel wrote:
The ratio of two quantities is 5 to 6. If each of the quantities is increased by 15, what is the ratio of these 2 new quantities?

A. 5:6
B. 25:27
C. 15:16
D. 20:21
E. It cannot be determined from the information given

Given $$\frac{x}{y} = \frac{5}{6}$$ ; find $$\frac{(x +15)}{(y+15)}$$

Here $$x = 5$$ and $$y = 6$$ or $$x=500$$ and $$y = 600$$ can give the same ratio for $$\frac{x}{y}$$, but will give different ratio when increased by 15.
Hence E) cannot be determined.

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Re: The ratio of two quantities is 5 to 6. If each of the quantities is in  [#permalink]

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19 Oct 2017, 07:43
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Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: The ratio of two quantities is 5 to 6. If each of the quantities is in &nbs [#permalink] 19 Oct 2017, 07:43
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