Average age of a college student is 16.5 years when 10 new students came whose average age 13.4 years then average become 16years. Find the number of students
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let the number of students be x
total age of x student =16.5x
10 student average age is 13.4
sum of their age =13.4*10=134
now total student =x+10
total age become 16.5x+134
16.5x+134/x+10=16
16.5x+134=16x+160
.5x=26
x=260/5=52
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