Subject :IMO Class : Class 6
The mean of five numbers is 12. If one number is removed, the mean of the remaining four numbers is 14. The number that was removed is
A2
B4
C6
D8
How to do it?
Ans 1:
Class : Class 6
As mean of 5 number is 12.
Therefore sum of the 5 number is 12x5=60
Mean of 4 number is 14
Sum=14x4=56.
Therefore the removed no.is 60-56=4