SSC Government Jobs Exams Numerical Ability Time and Work

A does half as much work as B in three fourth of the time. If together they take 18 days to complete a work, how much time shall B take to do it alone?

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SSC Other Question

A and B together can do a work in 10 days. B and C together can do the same work in 6 days. A and C together can do the work in 12 days. Then A, B and C together can do the work in Marbles a diameter 1.4 cm are dropped into a cylindrical beaker containing some water and are fully submerged. The diameter of the beaker is 7 cm. Find how many marbles have been dropped in it if the water rises by 5.6 cm.