One factory takes four days to produce an airplane, another takes five, and a third takes seven days. How long does it take the three factories combined to produce eighty-three airplanes?

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The Answer of One factory takes four days to produce an airplane, another takes five, and a third takes seven days. How long does it take the three factories combined to produce eighty-three airplanes?

One Factory Takes Four Days to Produce an Airplane, Another