Question

The sum of two numbers is x. If one of the numbers is 12, what is the other? 12 - x x - 12 12 + x 12 x

Answer 1

One of the number is 12.
The other number is y.
The sum of the numbers is x.


`12+y=x \\ y=x-12`

The other number is x-12.

Answer 2

Let

a-------> one of the numbers

b------> the other number

we know that

`a+b=x` ----> equation A

`a=12`

substitute the value of a in the equation A

`12+b=x`

solve for b

Subtract
`12` from both sides

`12+b-12=x-12`

`b=x-12`

therefore

the answer is

The other number is
`x-12`