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Doubts of Time and work sheet (Pages: 1 2 )

In this forum, please discuss the questions appearing in the QA class sheets :especially the practice and the DS questions at the end of the sheet.

Re: Doubts of Time and work sheet (Pages: 1 2 )

Postby sadmin » Fri Mar 01, 2013 5:42 am

Practice Questions

26. A does 1/4 of a work in 4 days. He is then assisted by B
and they together finish the remaining work in 6 days. B
alone can finish the whole work in:
(a) 9 days (b) 12 days
© 16 days (d) 20 days

Solution

A does 1/4th of the work in 4 days therefore A will complete the entire work in 16 days.

A and B do 3/4th of the work in 6 days

(1/16 + 1/b) * 6 =3/4 ( A alone has first finished 1/4th of the work in 4 days)

On solving the above equation we get B =16 days



Thus B = 9
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Re: Doubts of Time and work sheet (Pages: 1 2 )

Postby sadmin » Fri Mar 01, 2013 5:43 am

Practice Questions

27. 25 men can reap a field in 20 days. When should 15
men leave the work if the whole field is to be reaped in
37½ days after they leave the work ?
(a) 10 days (b) 5 days
© 4 days (d) 7 days

Solution

15 men should leave the work after "X" Days

25 x 20 = 25 X x + 10 X (37.5 )

500 - 375 = 25 x => x =125/25 or x = 5
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