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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 ?
1 answer
7/15
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Bilawal can build a wall in 15 days and Bilal in 20 days. If the work on it together for to days , then the fraction of the work
Top answer:
assuming you meant two days, then that would be 2(1/15 + 1/20) = ??
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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
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1/a + 1/b = 1/60 12/a + 36/b = 1 You sure there's no typo? I get a negative value for a.
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1/a + 1/b = 1/12 So, if A left after n days, A&B did n/12 of the work. 20/b = 1 - n/12 240 = 12b -
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