'A' completes a task in 5 days.
'B' completes the same task in 4 days.
How much time will it take for both to complete the given task?
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A=1/5days
B=1/4days
Then,
Lcm of 5 and 4 is 20.
divide 20 by 5 u will get 4 and divide 20 by 4 u will get 5.
now, u know the value of there works so add both u will get 9
=9days of time both A and B take.
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