Question

Class p has 30 students of which 20 students like music .In class q ,10 students like music.Find the number of students in class q if the average number of students in a class is 16

Answer 1

Answer:

I think 12

Step-by-step explanation:

guss sorry if it's wrong

Answer 2

Answer:

There are 20 students in class q.

Given Data:

N (students in class p) = 30

N (students in class p like music) = 20

N (students in class q who like music) = 10

N (students in class q) be 'x'.

Average number of students who like music in a class = 16

Step 1:

According to question, we have that  

$\frac{20 \times 30+10 \times x}{30+x}=16$

Step 2:

$\frac{600+10 x}{30+x}=16$

600 + 10x = 16(30 + x)

Step 3:

600 + 10x = 480 + 16x

600 – 480 = 16x – 10x

120 = 6x

X $= \frac{120}{6}$= 20