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Source: Economist GMAT
All of the students who took a certain test answered the two first questions on the test. If 60% of the students answered the first question on the test correctly, and 40% of the students answered the second question on the test correctly, then what percent of the students answered neither of the two questions correctly?
1) 20% of the students answered both the first and the second questions on the test correctly.
2) Two-thirds of the students who did not answer the second question on the test correctly answered the first question on the test correctly.
The OA is D
All of the students who took a certain test answered the two first questions on the test. If 60% of the students answered the first question on the test correctly, and 40% of the students answered the second question on the test correctly, then what percent of the students answered neither of the two questions correctly?
1) 20% of the students answered both the first and the second questions on the test correctly.
2) Two-thirds of the students who did not answer the second question on the test correctly answered the first question on the test correctly.
The OA is D
