Question

The sum of two numbers is 15. The first number is half of the second number. What are the two numbers?

Answer 1

5 and 10

Explanation:

X×Y=15

X=15-Y

X=Y/2

Y/2=15-Y

Add Y to both sides

3Y/2=15

3Y=30

Y=10

X=5

Answer 2

10 5

Explanation:

10 ÷ 2 = 5 and 5 + 10 = 15