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Mathematics, 12.02.2020 21:25 shanua

Twin brothers, Billy and Bobby, kid mother grandparents lawn together for 60 minutes. Billy could mow the lawn by himself in 20 minutes less time then it would take Bobby. How long will it take Bobby to mow the lawn by himself

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Twin brothers, Billy and Bobby, kid mother grandparents lawn together for 60 minutes. Billy could mo...
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