Question: Can you explain how to solve this math problem: Tom's restaurant gets 6 reservations a night.  They normally order 2 meals that cost $5 each and a $5 bottle of wine.  How much do they make a week if they are open 2 days a week?
Answer: 
The meals cost 2*5=$10 per table
So each table pays 10+5=$15 a night
So they make 6*$15=$90 a night
That means they make $90*2=$180 a week