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31) 2 men or 5 women or 7 boys can finish a work in 469 days, then the number of days taken by 7 men, 5 women and 2 boys to finish the work is
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32) The Ratio of efficiencies of A, B and C is 6 : 5 : 4 and if A, B and C received total Rs. 27000 for the whole work. What is the share of C, if the money is distributed in the ratio of amount of work done, individually?
Explanation :
Ratio of efficiencies of A,B and C = 6 : 5 : 4
∴ Share of C = [4/(6+5+4)] x 27000 = 7200
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33) If 2 men or 3 women or 4 boys can do a piece of work in 52 days. Then the same piece of work will be done by 1 man, 1 woman and 1 boy in ?
Explanation :
Work done by 2 men = 3 woman = 4 boys
∴ 1 man = 2 boys
1 woman = 4/3 boys
∴ boys X days = 4 X 52 (boys - days)
Again 1 man + 1 woman + 1 boy = 2 + 4/3 + 1 = 13/3 boys
B1 x D1 = B2 x D2 B = boys, D = days
4 X 52 = 13/3 x D2
D2 = 48 days
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34) A contractor undertook a work to complete in 60 days. But just after 20 days he observed that only 1/5th of the project work had been completed. To complete the work in time (i.e,In rest days) minimum how many workers he had to increase, if there were initially 75 workers were deployed for the task?
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35) 20 persons completed 1/3rd of the work in 12 days. How many more person are required to finish the rest work in next 12 days?
Explanation :
Work done = 1/3
Remaining work = 2/3
So for double work in same days we need double number of people i.e. 40.
So, 20 men will be increased.
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36) A and B can together do a piece of work in 15 days. B alone can do it 20 days. In how many days can A alone do it ?
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37) A and B can do a piece of work in 6 days and A alone can do it in 9 days. The time taken by B alone to do the same work is ?
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38) A and B can do a piece of work in 18 days, B and C in 24 days, A and C in 36 days. In what time can they do it all working together ?
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39) A and B can do a piece of work in 12 days. B and C in 15 days. C and A in 20 days. A alone can do the work in ?
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40) Find the error part: He proposed me (A)/ that we should go to the Disco (B)/ and then have (C)/ dinner at a restra (D)
Explanation :
Say, 'proposed to'.
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