In a school average age of hs students is 14 yrs and average age of up students is 7 yrs . Average age of the all students is 11 then find
a)Ratio of the number of students
b)Difference between the hs and up students are what % of the total number of students?
A4 : 3, 14.28%
B4:3, 25%
C5:7, 25%
D5:7, 14.28%