Class P has 30 students of which 20 like Music. In class Q, 10 students like Music. Find the number of students in Class Q if the average number of students who like Music in a class is 16.

• let the number of students in class Q be x, so here the total number of students in P is 30 and 20 people like music and in Q 10 like music , so the combined mean of students who like music in both the classes is 16(the average number of students who like music in a class)
  hence the applying formula of combined mean , ((30*20)+(x*10))/(30+x) = 16, solving we get x=20
• 6 years agoHelpfull: Yes(11) No(2)
• @SUNDARI
  the question is correct:
  solution will be :: ((30*20)+(x*10))/(30+x)=16
  solving equation ans will be x=20.
• 6 years agoHelpfull: Yes(7) No(11)
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