Answer:
250 = 3c - 20
Step-by-step explanation:
They have a goal to raise $250... but on top of that they will also need to pay $20 for the booth... that has to be covered by the cookies sales too, ensuring they have a net balance of $250 at the end.
So, with 250 = 3c - 20, they will cover that booth expense.
But how many dozens of cookies do they have to sell to reach their goal?
250 + 20 = 3c
270 = 3c
c = 90
They need to sell 90 dozens. Got milk? :-)
