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Who was president of the USA at the outbreak of World War I?
Which was the first talkie film of India?
Nicholas II was the last Emperor of which country until he abdicated following the February Revolution of 1917?
Who won the Nobel Peace Prize in 1979?
A and B can complete a work in 12 days. B and C can complete the same work in 18 days. C and A can complete in 24 days. How many days will take for A, B and C combined together to complete the same amount of work?
1/a+1/b = 1/12
1/b+1/c = 1/18
1/c+1/a = 1/24
2(1/a+1/b+1/c) = (6+4+3)/72
or 1/a+1/b+1/c = 13/(2*72)
or A , B and C together can finish in 144/13 or 11.1 days.
P is able to do a piece of work in 15 days and Q can do the same work in 10 days. If they can work together for 2 days, what is the fraction of work left?
If 15 men take 21 days of 8 hours each to do a piece of work. How many days of 6 hours each would 21 women take, if 3 women do as much work as 2 men?
A forms a wall in 10 days and B forms it in 15 days. A and B start the work of forming wall together but after 2 days A leaves the work. How many days are required for making the remaining wall by B?
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