Question

A can do a piece of work in 10 days and B can do it in 15 days.
In how many days will they together finish the work?
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Answer 1

Step-by-step explanation:

A s one day work = 1/10

Bs one day work = 1/15

A+ B = 1/10 + 1/15

A+ B = (15+10)/150

A+ B = 25/150

A+B = 1/6

A and B together can finish work in 6 days

Answer 2

Answer:

6 days

Step-by-step explanation:

A can do a piece of work in 10 days

In 1 day A can do=1/10 of work

B can do a piece of work in 15 days

In 1 day B can do=1/15 of work

in 1 day A and B can do=1/10+1/15

                                      =3+2/30

                                      =5/30

                                      =1/6

therefore A and B can do the work in =1/(1/6)

                                                              =6 days