The following are the ages (years) of 5 people in a room: 21 , 24 , 18 , 15 , 15 A person enters the room. The mean age of the 6 people is now 16. What is the age of the person who entered the room?
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Mean age of 5 people=21+24+18+15+15/5
=18.6 years
mean age of 6 people is 16
sum ofage of 5 people+age of 6th person/6=16
93+x/6=16
93+x=96
x=96-93=3 years
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