A is 30% more efficient than B .how much time they will working together take to complete a job which A alone could have done in 23 days?	Answers: A) 25 days B) 13 days C) 14 days D) 20 days E) 15 days
The ratio of times taken by A and 13 days=100:130=10:13   suppose 13 days can do work in x days   then 10:13::23:x   x=(23*13)/10   x=299/10   A's 1 day's work=1/23   13 days's 1 day's work=10/299   (A+13 days)'s 1 day's work =1/23+10/299 =23/299=1/13   A and 13 days together can do work in 13 days   Answer(13 days)
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A is 30% more efficient than B .how much time they will working together take to complete a job which A alone could have done in 23 days?