Let's use variables to represent the number of red and brown M&M's in the bowl. We can use r for the number of red M&M's and b for the number of brown M&M's. From the problem, we know that:
r + b = 13 (the bowl contains 13 M&M's in total)
r = b + 3 (there are three more red M&M's than brown M&M's)
We can use substitution to solve for one of the variables. Substituting the second equation into the first, we get:
(b + 3) + b = 13
Simplifying the equation, we get:
2b + 3 = 13
Subtracting 3 from both sides, we get:
2b = 10
Dividing both sides by 2, we get:
b = 5
So there are 5 brown M&M's in the bowl. To find the number of red M&M's, we can use the second equation:
r = b + 3
Substituting b = 5, we get:
r = 5 + 3 = 8
So there are 8 red M&M's in the bowl. Therefore, there are 8 red and 5 brown M&M's in the bowl