srkaleem wrote:
Six machines, each working at the same constant rate, together can complete a job in 12 days. How many additional machines, each working at the same constant rate, will be needed to complete the job in 8 days?
A. 2
B. 3
C. 4
D. 6
E. 8
Total work done = 12*6=72 unit
Same work to be done by let n machine in 8 days :
8*n=72 or n=9 machine
Hence extra machine require =9-6=3 nos
Sent from my iPhone usingGMAT Club Forum mobile app
...
![Will Linley – Head First – Single [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Music211/v4/3a/fe/29/3afe2925-2b4b-c869-f8bf-8a81bcd2ac03/26UMGIM95096.rgb.jpg/316x316bb.webp)
