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

Can you me find the missing length. i attached an image.

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.