a can do a piece of work in 12 days and b alone can do it in 14 days . how much time will both take to finish the work ?
this question can be solved by different methods . we need to conserve time in exams so solving this problem using equations is the good idea . time taken to finish the job = xy / ( x + y ) = 12 x 14 / ( 12 + 14 ) = 150 / 25 = 6.46 days answer : c
divide(const_1, add(divide(const_1, 12), divide(const_1, 14)))