Swati Mishra1 month agoMost voted3
this is how my coaching sir taught it. never going back to fractions
A does a job in 12 days, B in 18.
total work = LCM(12,18) = 36 units
A = 3 units/day, B = 2 units/day
together 5/day -> 36/5 = 7.2 days
works for pipes and cisterns too, leak is just negative units
2 answers
Priya Sharma1 month ago2
also easy for "A leaves after 4 days" type questions, just subtract A's units
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