Question

9. Working individually, A and B can complete a
piece of work in 30 days and 45 days, respectively.
If B joins A after some days and the whole work
is completed in 20 days from the beginning, after
how many days does B join A?
(a) 15
(b) 10
(c) 5
(d) 12​

Answer 1

15 its kysdhjjgjejaiksjfngngjgjcjcjcjjdosisisooqpspdockjcjfnfnfkfodososonddjc nvnvnngmfmdkskskdvkhkhkgkf

Step-by-step explanation:

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