Question

The mean age of 5 people in a room is 27 years. A person enters the room. The mean age is now 27. What is the age of the person who entered the room?

Answer 1

Answer:

lets say there are a, b, c, d, e people

$(a + b + c + d + e) \div 5 = 27$

lets say the 6th person be i

$(a + b + c + d + e + i) \div 6 = 27$

now from these two eqn

$((27 \times 5) + i) \div 6 = 27$

$i = 27$

the sixth person age is 27