Using the method of semi-averages, secular trend is measured when:
The correct answer is C
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Ram can do a piece of work in 50 days. He alone worked at it for 20 days and then Lakshman completed alone the rest work in 30 days. In how many days, t...
A and B together, B and C together and A and C together can complete a piece of work in 10 days, 14 days and 18 days respectively. Find the ratio...
A work can be completed by ‘A’ and ‘B’, alone in 14 days and 7 days, respectively. Find the number of days taken by ‘C’ to complete the same...
The ratio of efficiencies of X and Y for doing a certain work is 5 ∶ 9. Working together, they can complete a work in 15 days. X alone will complete 6...