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题库 / GMATAdvanced-DS-4
All trainees in a certain aviator training program must take both a written test and a flight test. If 70 percent of the trainees passed the written test, and 80 percent of the trainees passed the flight test, what percent of the trainees passed both tests?
(1)10 percent of the trainees did not pass either test
(2)20 percent of the trainees passed only the flight test
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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n+w+d+f=1
w+d=0.7
f+d=0.8
(1) n=0.1
将f，w都转换成d的表达式，可得0.1+0.7-d+d+0.8-d=1, 得d=0.6
d