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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? (A) 0.69 (B) 0.71 (C) 0.72 (D) 0.75 (E) 0.78
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IMO - D
Let the power of the 9 cylinder be 100
10 cylinder - 110
11 - Cylinder - 121
12 cylinder - 133
Ratio -100/133
Comes to approx 0.75.
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IMO - D
Let the power of the 9 cylinder be 100
10 cylinder - 110
11 - Cylinder - 121
12 cylinder - 133
Ratio -100/133
Comes to approx 0.75.
Better approach someone?
- VivianKerr
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Let's say a 9 cylinder engine has a power of 100
A 10 cylinder would be 110
An 11 cylinder would be 1.1 x 110 = 121
A 12 cylinder would be 1.1 x 121 = 133.1
The ratio is 100/133.1 = approx .75.
IMO: D.
A 10 cylinder would be 110
An 11 cylinder would be 1.1 x 110 = 121
A 12 cylinder would be 1.1 x 121 = 133.1
The ratio is 100/133.1 = approx .75.
IMO: D.
Vivian Kerr
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GMAT Rockstar, Tutor
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Former Kaplan and Grockit instructor, freelance GMAT content creator, now offering affordable, effective, Skype-tutoring for the GMAT at $150/hr. Contact: [email protected]
Thank you for all the "thanks" and "follows"!