If the sum of two numbers is 15 and their difference is 5. Find the two numbers.

Question: If the sum of two numbers is 15 and their difference is 5. Find the two numbers.

Solution:
Let the two numbers be x and y. Then,
x + y = 15 .......(1)
x − y = 5 .......(2)

Adding equation (1) and (2), we get,
2x = 20
∴ x = 10

Thus, y = 5
Hence, the required numbers are 10 and 5.