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

[" 4.A does "20%" less work than "B" .If A can finish a piece of work in "7(1)/(2)" hours,then "B" can "],[" finish it in "],[[" (a) "5" hours "m-," (b) "5(1)/(2)" hours "," (c) "6" hours "," (d) "6(1)/(2)" hours "]]

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