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

[" 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 "," (b) "5(1)/(2)" hours "," (c) "6" hours "," (d) "6(1)/(2)" hours "]]

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