Mathematics, 04.10.2021 14:00 kendall984

Twin brothers, billy and bobby, can mow their grandparents lawn together in 69 minutes. Billy could mow the lawn by himself in 30 minutes less time that it would take bobby. How long would it take bobby to mow the lawn by himself?

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Twin brothers, billy and bobby, can mow their grandparents lawn together in 69 minutes. Billy could...

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