Question

The sum of the two numbers is 15. Find the number when the one number is twice of the other​

Answer 1

Let x be a number and let y be the other number:

x+y=15

x=2y

Substitute 2y for x:

2y+y=15

3y=15

y=5

x=10

Answer 2

Step-by-step explanation:

let first number is X and the other is Y so 2X+Y=15 then substitute one value and find the other I was solving but it's time shortcut