Mathematics, 22.12.2019 21:31, jfy3341

Mr. duc asked perry to set up 450 chairs in a large hall. perry puts 20 chairs in each row. he has already set up 15 rows of chairs. how many more chairs must he set up?

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Mr. duc asked perry to set up 450 chairs in a large hall. perry puts 20 chairs in each row. he has a...