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Question: A can do a certain job in 12 days.B is 60% more
efficient than A. How many days does B alone take to do the same job?
Solution:
B will do the same work in (12*100)/160= 7.5 days
Question: 45 men can complete a work in 16 days.
Six days after they started working, 30 more men joined them.
How many days will they now take to complete the remaining work?
Solution:
After six days:
45*10=75*x
X=6 days
Question: A is twice as good a workman as B and together
they ?nish a piece of work in 18 days. The number of days taken by A alone to ?nish the work is:
Solution:
A=2B (work)
3B works in 18 days so B will do the same in (18*3)=54 days
hence A will do it in 54/2=27 days
Together they will take 42/(1+2)=14 days
Question: A and B can Complete a work in 15 days and
10 days respectively. They started doing the work together
but after 2 days B had to leave and A alone completed the
remaining work. The whole work was completed in:
Solution:
A and B can complete whole work in
30/(2+3)=6 days
Part of work completed together in
3 days =2/6=1/3 part
Now 2/3 part will be completed by A in
2/3*15=10 days
Hence, whole work will be completed in
2+10=12 days
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