One number is 15 more than a second number. The sum of the number 115. What are the numbers?

The first number is 65
The second number is 50

X= first number
Y= second number

X+Y= 115 > or 2y+15= 115 > subtract 15 from both side

2y= 100> divide by 2 on each side> y=50

There you have solved for y, now solve x

X= 50+15 > which is 65

So therefore, the first number is 65 and the second is 50.

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.