A can do in one day three times the work done by B in one day. They together fin

Question

A can do in one day three times the work done by B in one day. They together finish $$\frac{2}{5}$$ of the work in 9 days. The number of days by which B can do the work alone is = ?

Options:

A . 90 days

B . 120 days

C . 100 days

D . 30 days

Answer: Option A

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