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[" 63.A man,a woman and a boy can comple...

[" 63.A man,a woman and a boy can complete a job in "3,4" and "12" days respectively.How "],[" many boys must assist "1man" and "1" woman to complete the job in "(1)/(4)" of a day? "],[[" (a) "1," (b) "4," (c) "19," (d) "41]]

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