Question

The sum of two number is 87. If one exceeds the other by 9, find the number???

Answer 1

let two number be x and y
given
x=y+9
also
x+y=87
on keeping value of x in this
y+9+y=87
2y=87-9
2y=78
y=39
x=39+9=48

Answer 2

Let the first number be x
then the two numbers are x and (x + 9)
 x + (x + 9) = 87
 x + x + 9 = 87
 2x + 9 = 87 
 2x = 87 - 9
 2x = 78
 x = 78 / 2
 x = 39
The two numbers are 
1. x = 39
2. (x + 9) = 39 + 9 = 48

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