Question

The average of 6 numbers is 20. If anumber is removed then average becomes 15. In place of
removed number by adding a number 39 the average of new 6 numbers will be ....

Answer 1

Answer:

The mean of 6 number=20

The sum of 6 number=6×20=120

If one number is excluded

Then mean of 5 number=15

Sum of 5 number=5×15=75

∴excluded number=120−75=45