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a cafeteria with 40 tables can sit 600 people. some tables can sit 10 people and some can sit 20 people. what is the ratio of the number of 10 person tables to the number of 20 person tables?

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superpowergirl
Correct answer: Since there are 40 tables in the cafeteria, x + y = 40. 10x represents the number of people sitting at 10-person tables, and 20y represents the number of people sitting at 20-person tables. Since the cafeteria can seat 600 people, 10x + 20y = 600.
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