Quantitative Aptitude Ques 1615

Question: M and N can do a work in 10 days and 15days respectively. If M starts on the work and bot work alternately day after day, in how many days will the work be completed?

Options:

A) 10

B) 12

C) 8

D) 9

E) None of these

Show Answer

Answer:

Correct Answer: B

Solution:

  • [b] Work done in 1st two days $ =\frac{1}{10}+\frac{1}{15}=\frac{3+2}{30}=\frac{1}{6} $
    $ \therefore $ Number of days $ =2\times 6=12 $