Answer:
The numbers are 4 and 11. 
Explanation:
If one number is 7 more than the other, you can express that as x+7 is equal to the other number which we can call "y". 
If you add "y" which is basically x+7 to x, which is one of the numbers, your equation will be x+x+7=15. 
Simplify: 2x+7=15. 
Subtract 7 from both sides of the equation and you have 2x=8. 
Divide by 2 on both sides and x is equal to 4. 
You plug 4 back into the expression "x+7". 
4 plus 7 is 11.