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
Time taken - 57 Seconds
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?
