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[" (d) Cannot be determined "],[" A man,...

[" (d) Cannot be determined "],[" A man,a woman and a boy can complete a job in "3,4" and "12" days respectivels.How "],[" many boys must assist "1" man and "1" woman to complete the job in "(1)/(4)" anf a day "],[" many boys must assist "1" man and "1" woman to complete the job in "(1)/(4)" and "],[" many boys "]

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