Question

State the equation for: The sum of two numbers is 21. One number is one more than the other.

Answer 1

So,

Let "x" and "y" be the numbers that we're asking for.

As we know, one number is one more than the other, so we could write:

`x+y=21`

And,

`y=x+1`

Now, the equation that we could state is:

`x+x+1=21`