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A restaurant has 10 booths that will seat up to 4 people each. If 20 people are seated in booths, and NO booths are empty, what is the greatest possible number of booths that could be filled with 4 people?
The correct answer is D.
Because no booths can be empty, assume 1 person sitting in each booth. That leaves 10 people remaining.
How many booths can be filled up with another 3 people each? You can get 3 groups of 3 people from the 10 remaining people. That means that you can fill at most 3 booths with 4 people.