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a does 80% of work in 20 days a does not divide b a does not name a type a does not have an apex a does half as much work as b a does 20 less work than b a does not equal b a does half as much work as b in 3/4 of time a does 20% less work than b a does work in 10 days a does half as much work as b in 1/6 of time