A can do a certain work in 12 days. B is 60% more efficient than A. How many days does B alone take to do the same job ? Choose the most appropriate option:
A) 19
B) 15
C) 16
D) 17
E) 18
Ratio of time taken by A &amp; B = 160:100 = 8:5 Suppose B alone takes x days to do the job. Then, 8:5::12:x = &gt; 8x = 5*12 = &gt; x = 15 days.
<result>B</result>
A can do a certain work in 12 days. B is 60% more efficient than A. How many days does B alone take to do the same job ?