Question

sum of two number is 40 .if one of them is 10 more than the other ,find the numbers

Answer 1

Let one of the number be 'x'
Then the other number is x+10
Given their sum is 40
x+x+10=40
2x+10=40
2x=30
x=15
Therefore the numbers are 15,25.

Answer 2

let the one be x 
than the other will be 10+x
than, equation formed
10+x+x=40
x+x=40-10
2x=30
x=30/2
x=15
therefore, the numbers are
x=15, 10+x=10+15=25
15,25