Wipro Company Numerical Ability Percentage

At a certain institution, 50 percent of the total number of students are freshmen. If 20 percent of the fresh-men are enrolled in the school of liberal arts and, of these, 30 percent are psychology majors, what percent of the students at the institute are freshmen psychology majors enrolled in the school of liberal arts?
A. 3%
B. 6%
C. 12%
D. 15%
E. 20%

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Wipro Other Question
A bus traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the town. If the bus traveled 6 fewer miles per gallon in the town than on the highway, how many miles per gallon did the bus travel in the town?
A. 14
B. 16
C. 21
D. 22
E. 27 If the tens digit a and the units digit b of a positive integer x are reversed, the resulting integer is 9 more than x. What is b in terms of a ?
A. 10-a
B. 9-a
C. a+9
D. a-1
E. a+1