Question

The average of 5 numbers is 25,if one number is excluded became 20.the excluded number is?

Answer 1

Let the sum of numbers= x
x/5=25
=>x=25*5
=>x=125

Now,
Let the no that is excluded be y.
Then,
x--y/4(5--1)=20
=>125--y/4=20
=>125--y=20*4
=>125--y=80
=>125--80=y
=>45=y