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I think that'd be 8 hours. 6/3 = 2 hours/worker. One less worker, 2 more hours.

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nine hours

Each bricklayer can complete 1/3 of the wall in 6 hours.

Two brick layers can complete 2/3 of a wall in 6 hours (2 x 1/3).

To complete the other 1/3 of the wall, the two brick layers would need another 3 hours.

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Q: If it takes 3 brick layers 6 hours to build a wall how long would it take 2 brick layers to build the same wall?
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