The following are the ages (years) of 5 people in a room: 12, 17, 13, 20, 15 A person enters the room. The mean age of the 6 people is now 17. What is the age of the person who entered the room?
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(14+22+14+13+18+) /6 = 15
14+22+14+13+18+ = 15×6
81+ = 90
= 90–81
= 9
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