The mean age of 5 people in a room is 40 years. A person enters the room. The mean age is now 40. What is the age of the person
who entered the room?
1 answer:
Answer:
40
Step-by-step explanation:
5 people in the room have 5*40 = 200 years altogether
a new person is X years old.
Now 6 people have (200 + x) years altogether.
Mean age of 6 people is (200+x)/6. and it is also = 40.
So,
(200+x)/6 = 40
200 + x = 240
x = 40
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