In one class there are 600 student of them boys average age is 12years and girls average age is 11years and all the students average age is 11year 9months then no of boys will be?
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Step-by-step explanation:
let number of boys be x
total sum of ages of 600 students=600*47/4=7050 yrs
total age of boys=12x
total age of girls=6600-11x
12x+6600-11x=7050
x=7050-6600
=450
number of boys=450
number of girls=150
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