Question

the average of 5 numbers is 27 if one number is excluded the average become 25 find the exclude number

Answer 1

let a, b, c, d, e is 5 people
avg=27
a+b+c+d+e/5 =27
a+b+c+d+e =27×5
=135
after excluding avg=25
a+b+c+d/4 =25
a+b+c+d =25×4=100
a+b+c+d=100
substitute in a+b+c+d+e =135
100+e=135
e=135-100
e=35 is number

Answer 2

here is the easy way ...