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Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?