15 men ,working 8 hours a day, can build a wall in 20 days , in how many days will 20 men build the same wall working 5 hours a day?
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W/ WF x T
W is workdone
WF is workforce
T is time
W/15x8x20 = W/20x5xT
20x5xT = 15x8x20
T = 24 days
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