The average age of boys in a school with 560 students is 12 years and that of girls is 11 years. If the average age of a school is 11 years 9 months, then what will be the number of girls in the school?

The average age of boys in a school with 560 students is 12 years and

1.	The average age of boys in a school with 560 students is 12 years and that of girls is 11 years. If the average age of a school is 11 years 9 months, then what will be the number of girls in the school?
A.	120
B.	150
C.	100
D.	140
Answer» E.