a does thrice as much work as B in a day .if B does a piece of work in 12 days .in how many day they together do it?
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Step-by-step explanation:
b completes a piece of work in 12 days
in one day B will be able to do 1/12 part of work
A will be able to do 3*1/12 = 3/12 part of waork in one day
they together will be able to do (3/12+1/12) = 4/12=1/3 part of work in one day
hence, they together will be able to complete the work in 3 days
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