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Average age of students of an adult school is 40 years One hundred and twenty new students whose average age is 32 years join the school This causes the average age of the school to be reduced by 4?
Wiki User
∙ 11y ago
let the number of students be x. The sum of all their ages = 40x
120 joined
total is x+120
The sum of all their ages = 40x+ 120*32
=40x + 3840
average age now is 36
40x+3840 / x+120 =36
40x+3820 = 36(x+120)
40x+3840 =36x + 4320
40x-36x= 4320-3840
4x= 480
x= 120
initially there were 120. 120 joined. so total isd 240 students
Wiki User
∙ 11y ago
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