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[" A.A does "20%" less work than "B" .If...

[" A.A does "20%" less work than "B" .If "A" can complete "],[" a piece of work in "7(1)/(2)" hours,then "B" can do "],[" it in "],[[" (a) "5" hours "],[" (c) "6" hours "," (S.S.C."2006)]]

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