A can do a work in 14 days. B is 40% more efficient than A. How many days does B alone take to do the same job?
Choices
A) 9  B) 10  C) 11  D) 12  E) 8
Ratio of times taken by A and 10 = 140:100 = 7:5   suppose 10 alone to take x days to do the work   then, 7:5::14:x   7x= 5*14   x=10 days   correct option is 10
<result>B</result>
A can do a work in 14 days. B is 40% more efficient than A. How many days does B alone take to do the same job?