Question

The average age of boys in a class of 30 is 18 years if 10 more boys joins the class the average age of the whole class get increases by a year what is the average age of the newcomers​

Answer 1

Step-by-step explanation:

Average age of the new comers

---->(30+10) (18+1)-30×18/10

----->40×19-30×18/10

------>760-540/10

------->220/10=22

the average of new comers of 10 is 22

Answer 2

HEY MATE.

let sum of age of 30 students=x.

given here:

average of 30 students=18.

so.

==>x/30=18

==>x=540.

sum of age of 30 students=240.

a/c.

10 more students join the class so. average increase one year .

or..

==> (X+10)/40=19.

==>x+10=760.

==>x=750.

so ,,

sum of 10 students

. =750-540

. =210.

so ,

average of 10 students

. =210/10

. =21.

i hopes its helps u.

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@Abhi.

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