A can do a piece of work in 10 days, b can do it in 15 days. In how many days both of these can together complete the job
a. 25 days
b. 20 days
c. 6 days
d. None
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1/10 + 1/15
= (15 + 10)/150
= 25/150
= 1/6
Hence in 6 days both will complete it.
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