The Sum Of Two Numbers Is 68 And Their Difference Is 10

The problem given says that 2 unknown numbers are given, whose sum is equal to 68 and the difference is 10. Let's find the two numbers :

When we add the two numbers :
X + Y = 68

The difference of two numbers :
X - Y = 10

Solution :

If we add the two equations eachother , then we can find the first number.

X + Y = 68
X - Y = 10

2X = 78

Let's divide 78 to 2 for the first number "X" .

X/2 = 39

First number is 39

X + Y = 68
So ;
39 + Y = 68
Y = 68 - 39
Y = 29

Second number is 29

Question & Answer
The Sum Of Two Numbers Is 68 And Their Difference Is 10 : 39 And 29