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? Pick:  A) 5%  B) 10%  C) 16%  D) 22%  E) None of these
Explanation :   The number of female engineering students in the class is (20/100)×100=20.   Now, 25% of the female engineering students passed the final exam: 25.   Hence, the number of female engineering students who passed is 5.   There are 120 male students in the class. And 25% of them are engineering students.   Hence, the number of male engineering students is (1/4)×120=30.   Now, 20% of the male engineering students passed the final exam :- 20.   Hence, the number of male engineering students who passed is 6.   Hence, the total number of engineering students who passed is:   (Female Engineering students who passed)+ (Male Engineering students who passed)   =&gt;5+6= 
<gadget id="calculator">5+6</gadget>
<output>11</output>
11.   The total number of engineering students in the class is:   (Number of female engineering students)+ (Number of male engineering students)=   =&gt;30+20= 
<gadget id="calculator">30+20</gadget>
<output>50</output>
50   Hence, the percentage of engineering students who passed is :-=&gt;(Total number of engineering students passed/ Total number of engineering students) ×100.   =&gt;(11/50)×100.   =&gt; 22%.   Answer : 22%
<result>D</result>
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?