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In a small town, 16 people own Fords and 11 people own Toyotas. If exactly 15 people own only one of the two types of cars, how many people can own both types of cars?

A. 2
B. 6
C. 7
D. 12
E. 14

Think about it logically:
16 people own Fords and 11 own Toyotas. So maximum 11 people can own both which means at least 5 people will own only one car (only Ford). If you want 15 people to own only one car, you need to remove 10 people from the overlap of 11. For every one overlap, there are 2 people so if you remove 5 overlaps, you get 10 people who should own a single car. You are left with 6 overlaps.

Answer (B)
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We know the total number of cars, but we don't know the total number of people.

1. There are 27 cars in total. 11+16=27 cars
2. Stimulus states that 15 people own only one car. How many cars are left after we subtract 15 cars with a single owner from the total of 27 cars? 27-15(1)=12 cars remain.
3. Since each owner of the remaining cars owns 2 of them and there are 12 remaining cars, there must be 6 owners that own more than one car. X(2)=12 -> X=6
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