Question

If the sum and difference of two numbers are 20 and 6 respectively, find the numbers.

Answer 1

Let the two numbers be x and y 

ATQ 

x + y = 20  (1) 

and x -y = 6 (2) 

adding (1) and (2) 

2x = 26 

x = 13 

 x + y = 20 

y = 20 - 13 = 7 

Answer 2

let the number be x and y
according to the above given equation
X + Y is equal to 20 _1
x minus Y is equal to 6 _2
adding the two equations
we will get
(x+y)+(x-y)=26
2x=26
x=13
putting the value of x in any of the above given equation
we will get the value of Y as 7

hope this might help