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12 men can finish a piece of work in 25 ...

12 men can finish a piece of work in 25 days. The number of days in which the same piece of work can be done by 20 men, is
(a) 10 days     
(b)  12 days  
(c)  15 days        
(d)   14 days

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RD SHARMA ENGLISH-RATIO, PROPORTION AND UNITARY METHOD-All Questions
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  12. If six men can do a piece of work in 6 days, then 3 men can do same ...

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  13. If 4:5::x : 45, then x= (a) 54 (b) 60 (c) 36 (d) 30

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