15 boys and a certain number of girls appeared for a test. The average score of the boys was 26; the average score of the girls was 36, while the combined average score was 30. How many girls appeared for the test?
Answer & explanation
Correct answer: option 1
Let number of girls = A
ATQ ,
15 × 26 + A × 36 = ( 15 + A ) × 30
390 + 36A = 450 + 30A
6A = 60
A = 10
So , Number of girls who appeared in test are 10