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

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

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