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# M09 #12

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Director
Joined: 25 Oct 2008
Posts: 600
Location: Kolkata,India
Followers: 15

Kudos [?]: 906 [0], given: 100

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05 Oct 2009, 18:22
If the power of an engine grows by 10% when the number of its cylinders is increased by one, which of the following is closest to the ratio of the power of a 9-cylinder engine to that of a 12-cylinder engine?
# 0.69
# 0.71
# 0.72
# 0.75
# 0.78
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http://gmatclub.com/forum/countdown-beginshas-ended-85483-40.html#p649902

Manager
Joined: 10 Jul 2009
Posts: 165
Followers: 2

Kudos [?]: 106 [0], given: 8

Re: M09 #12 [#permalink]

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06 Oct 2009, 21:29
Let power of 9 cylinder engine is p
Power of 9 cylinder / Power of 11 cylinder = p/(1.1*1.1*1.1 *p) = 1000/1331 ~ 100/133
= 100/ (4 *100/3) ( As 4/3 = 1.33)
= 3/4 = .75
Director
Joined: 25 Oct 2008
Posts: 600
Location: Kolkata,India
Followers: 15

Kudos [?]: 906 [0], given: 100

Re: M09 #12 [#permalink]

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06 Oct 2009, 23:00
Could you please elaborate?It's not clear..
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http://gmatclub.com/forum/countdown-beginshas-ended-85483-40.html#p649902

Manager
Joined: 10 Jul 2009
Posts: 165
Followers: 2

Kudos [?]: 106 [0], given: 8

Re: M09 #12 [#permalink]

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07 Oct 2009, 10:34
Let power of 9 cylinder engine is a
Power of 10 cylinder engine = a* 110/100 = 1.1a
Power of 11 cylinder engine = 110/100(1.1a)
= 1.1*1.1*a
Similarly power of 12 cylinder engine = 1.1*1.1*1.1*a

Power of 9 cylinder engine / Power of 12 cylinder engine = a/(1.1*1.1*1.1*a)
= 1/1.331 = 1000/1331 ~ 100/133

but 133 can be written as 400/3
So 100/133 = 100/(400/3) = 3/4 = 0.75
Re: M09 #12   [#permalink] 07 Oct 2009, 10:34
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# M09 #12

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