For example, the sum of two numbers is 10, and the difference is 2. Find two numbers.

Solution: Let the large number be x and the decimal number be (10-x).

x-( 10-x)=2

x- 10+x=2

2x=2+ 10

x=(2+ 10)/2

Find a large number = (sum+difference) /2

Solution: Let a decimal number be x+2.

x+x+2= 10

2x= 10-2

x=( 10-2)/2

Decimal = (sum and difference) /2