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# fractions puzzle

Author Message
Manager
Joined: 08 Oct 2010
Posts: 212

Kudos [?]: 859 [0], given: 974

Location: Uzbekistan
Schools: Johnson, Fuqua, Simon, Mendoza
WE 3: 10

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25 Oct 2010, 02:12
00:00

Difficulty:

35% (medium)

Question Stats:

86% (00:41) correct 14% (00:16) wrong based on 7 sessions

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If A:B is 2:3 and B:C is 3:4 then A:C is equal to
a) 2:3
b) 6:7
c) 5:6
d) 1:2
e) 3:4
[Reveal] Spoiler: OA

Kudos [?]: 859 [0], given: 974

Manager
Joined: 15 Apr 2010
Posts: 171

Kudos [?]: 104 [0], given: 25

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25 Oct 2010, 03:20
Since A:B = 2:3 and B:C = 3:4,

We can deduce that A:B:C = 2:3:4

So, A:C = 2:4 = 1:2.

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Kudos [?]: 104 [0], given: 25

Manager
Joined: 16 Oct 2010
Posts: 86

Kudos [?]: 70 [0], given: 3

Location: United States
Concentration: Finance, Entrepreneurship
GMAT 1: 700 Q49 V35
WE: Information Technology (Investment Banking)

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25 Oct 2010, 03:26
feruz77 wrote:
If A:B is 2:3 and B:C is 3:4 then A:C is equal to
a) 2:3
b) 6:7
c) 5:6
d) 1:2
e) 3:4

It's a simple question.
The two ratios given are having the same number 3 for B in both the ratios.
Hence- A:B = 2:3 & B:C = 3:4
=> A:C = 2:4 => 1:2. (D)

The question could have a different number also for B in both the ratios given.
For example: A:B = 2:3 & B:C = 4:5
In that case you need to normalize both the ratios so that the common entity (B here) have the same number, so as to come up with the ratio A:C.
In this case, multiply the first (A:B) with 4 => A:B = 8:12
and multiply the second (B:C) with 3 => B:C = 12:15
Hence A:C = 8:15
Remember- multiplying a ratio with a same number does not impact it.
becasue A:B = 2:3 essentially is A/B = 2/3 and 2/3 can be re-written as (2*4)/(3*4) = 8/12.

Kudos [?]: 70 [0], given: 3

Re: fractions puzzle   [#permalink] 25 Oct 2010, 03:26
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