1) There were 400 penguins per 20 miles. More penguins showed up, the penguins that showed up were equivalent to 70 miles. How many penguins showed up?
2) Leandro owns 20 houses per street. He owns 12 streets. How many houses does he own?
3) Mark gets $60 per week. It has been 9 weeks, how much has he earned?
4) Melissa drank 7 cartons milk, each milk carton is 478 mL. How many mL of milk has she drank?
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