GMAT Question of the Day - Data Sufficiency - Overlapping Sets
Of the leopards at a certain zoo, 20% are both spotted and mature. If all the leopards at the zoo are either spotted or not spotted, or mature or immature, is the ratio of the number of immature leopards who are spotted to the number of immature leopards who are not spotted greater than 1?
(1) If the number of immature spotted leopards doubled than there would be 102 total leopards at the zoo.
(2) If the number of immature but not spotted leopards were decreased by a half there would 86 total leopards at the zoo.
GMAT Question of the Day Solution
This overlapping sets question might leave you feeling a bit empty. Thinking - what was the point of that? Well, the point of that was to define the information that you were given and then to realize that you didn't have enough to answer the questions. That's what DS questions with an "E" answer are like. Sometimes there is no further meaning than just plain old insufficient.