The answer is distribute property
Answer:
The answer is 3
Step-by-step explanation:
7 - 4 = 3
So, 3+4=7
Answer:

Step-by-step explanation:
Hello,
as the mean age of 5 people is 40
it means that the sum of the 5 ages is 40*5=200
now a person enters the room, let's note x his age
the new mean is


So the age of the new person is 16
hope this helps