How many small dogs are signed up to compete. ?

It’s here.

Here’s the math behind the problem.

What you’re doing is trying to solve for x. Think of large dogs as “x” and small dogs as “y.” 49 = x + y and y = x + 36 So, combine the two equations and you get:

49 = x + x + 36

49 = 2x + 36

13 = 2x

x = 6.5

y = 42.5