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Bilawal can build a wall in 15 days and Bilal in 20 days. If the work on it together for 4 days , then the fraction of the work ?

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A 1/15 wall / day
B 1/20 wall / day

together 1/15 + 1/20 = 7/60 wall/day

times 4 days = 28/60 = 7/15 wall

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