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?

Which situation is the best example of opportunity cost? a country chooses to produce bananas instead of wheat. a country chooses to invest in manufacturing and agriculture. a country chooses to specialize in producing paper products. a country chooses to export all of its products.