So, let’s start with the beginning.
The sum of two numbers is 37:
This would look like-
a + b = 37
Then the next part
The larger number to 21 more than the smaller number.
So, that would mean that a (let’s say that’s the bigger number) would be 21 more than the smaller number (b).
This would mean:
a = 21 + b.
Now that we know what a is, we can replace it in the equation.
(21 + b) + b = 37
I’m not sure whether you should solve it further or just keep the equation as it is.
If you want me to tell you how to solve the equation just reply in the comments! But i’m sure you can figure it out :)