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You and your brother each start a child-care service. You spend $50 on supplies and plan to charge $10 per hour. Your brother spends $30 on supplies and plans to charge $8 per hour. How many hours will each of you have to work to earn the same amount of money?
You: spends $50 on supplies charges $10 per hour ⇔ [The number that 10 & 8 both have in Brother: spends $30 on supplies common is 40] charges $8 per hour ⇔ ↓ You: 10 x 4= 40 [You'll work 4 hours to get the same amount of money.] ↓ Brother: 8 x 5= 40 [Your brother will work 5 hours to get the same amount of money.]
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