You use a system of equations
x= coffee
y= donuts
x+y=100
3x+y=180
there’s 3 ways to solve system of equations substitution graphing and elimination. it would be easiest to use substitution here. So you multiply x+y=100 by -1 so it become -x-y=-100. then you combine it with the other equation and get 2x=80 so x=40 which means 40 cups of coffee were sold then you plug it back in to find y. 40+y=100. y=60.
y= 60 (donuts). x= 40 (coffee)
For this case we have the following functions:

We must find:

By definition, we have to:

So:

Then, we evaluate in x = 2:

ANswer:

Answer: 11 child tickets
Explanation: (look at picture)
Answer:
The answer is option C
Step-by-step explanation:
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