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question has asked What percentage of engineering students passed the exam
you have calculated total % of class...


Dare Devil
In an acoustics class, 120 students are male and 100 students are female. 25% of the male students and 20% of the female students are engineering students. 20% of the male engineering students and 25% of the female engineering students passed the final exam. What percentage of engineering students passed the exam?

(A) 5%
(B) 10%
(C) 16%
(D) 22%
(E) 25%

engineering Male students = 0.25*120 = 30
engineering female students = 0.2*100 = 20

engineering Male students passed = 0.2*30 = 6
engineering Male students passed = 0.25*20 = 5

Total engineering students passed = 11/220 = 5%

Option A is correct
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In an acoustics class, 120 students are male and 100 students are female. 25% of the male students and 20% of the female students are engineering students. 20% of the male engineering students and 25% of the female engineering students passed the final exam. What percentage of engineering students passed the exam?

(A) 5%
(B) 10%
(C) 16%
(D) 22%
(E) 25%

0.25 x 120 = 30 male engineering students.

0.2 x 100 = 20 female engineering students.

0.2 x 30 = 6 male students passed, and 0.25 x 20 = 5 female students passed.

The percentage of engineering students who passed the exam was 11/50 = 22/100 = 22%.

Answer: D
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