a can complete a piece of work in 9 days and b can complete it in 18 days.but due to illness they can use 90%and 72% of their efficiency.if both work together then in how many days they will complete 3/4 th part of the work.
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a=1/9
his efficiency decreased by 90%
i.e,(1/9)-(90/100)(1/0)
a=1/90
similarly we get efficiency of b after getting decreased by 72% is (7/18*25)
let x be no.of days to complete whole work
x((1/90)+(7/18*25))=1
from this we get x=37.5
if they complete a work in 37. 5 days them he can complete 3/4th work in 28.125 days
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