A can complete 3/4th of the task in 15 days and his son, B can complete the same task in 40 days. If they work together in how many days the task is completed?
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A 3/4 oftask in 15 days
full task. in 2o days
Sonin 4o days
A,s one day work=1 / 20
sons. 1/4 o
A+sons 1 day work=1/20 +1/4 o
= 3/40
A&son will complete the workin
I3 1/40days
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