Question

The following are the ages (years) of 5 people in a room:

17, 21, 15, 15, 25
A person enters the room.
The mean age of the 6 people is now 25.
What is the age of the person who entered the room?​

Answer 1

age=57

Explanation:

ages=17 21 15 15 25 ?

17+21+15+15+25=93(old mean)

17+21+15+15+25+?=25(new mean)

25(new mean)*6(number of numbers)=150

?=150-93=57

= 57

Answer 2

57 years

Explanation:

total=25*6=150

17+21+15+15+25+x=150

93+x=150

x=150-93

x=57