Mathematics, 20.04.2020 02:46 asuhdude57

The first bricklayer can build a wall in 15 days, the second bricklayer can build the same wall in 20 days. How long will it take them to build the wall together?

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The first bricklayer can build a wall in 15 days, the second bricklayer can build the same wall in 2...

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