Hello!
First of all, let's how many chocolate and maple donuts there were using a system of equations.
m= c-6
m+c=10
Let's plug our m value into the second equation and solve for c.
c-6+c=10
-6+2c=10
We add 6 to both sides.
2c=16
We divide both sides by 2.
c=8
This also means that there were 2 maple donuts.
Therefore, she bought 8 chocolate donuts.
Also, the sum and difference are in the problem. The sum is 10 and the difference is 6.
I hope this helps!