Question

2years ago The mean of ages of 40people is 11.now a person has left the group and the mean is changed to 12.what is the age of the person left.

Answer 1

40 -11

12 -?

in 2 years ago

Step-by-step explanation:

so 40×1

12×11

cross multiplication

so 132÷40

3.3

=5.3