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Write a corresponding real world problem to represent 2x - 125=400

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?