nive28 wrote:
At all points Mid-Sized car has greater mileage than compact cars. So straight away we can eliminate options C,D,E.
Had 4 options been greater than 100% the problem could have been solved by now.
But we have two options to look at- 80% and 90%.
Now, to avoid unnecessary calculation- we know the part wise gallons consumed (by looking at the graph).
Compact- Part 1: 3/2, Part 2: 5/3
Mid-Sized- Part 1: 4/3, Part 2: 3/2
Clearly, 3/2 is common (here Jill's car consumes 100% as John's car) & 4/3 is in itself 80% of 5/3. Hence the answer HAS to be much greater than 80%. Hence answer is 90% which is OPTION B.
it is not true, for Jill, both are 4/3. In other word, it is 8/3 and the formula should be 16/19 which is approximately 84%