The sum of two numbers is 39 and the difference is 3. What are the numbers?

Answer: 21 & 18

Step-by-step explanation:

Sum of two numbers is 39

Difference is 3

Let the numbers be x & y

X+y=39 ... equation 1

X-y=3 ... equation 2

X=3+y ... equation 3

Substitute equation 3 into equation 1

(3+y) + y=39

3+y+y=39

3+2y=39

2y=39-3

2y=36

Y=36/2

Y=18

Substitute for y in equation 2

X-y=3

X-18=3

X=3+18

X=21

The two numbers are 21 & 18