Question

Mohan can do certain job in 12 Days sohan is 60% More efficient than mohan find number of days taken by sohan to finish the job

Answer 1

160/100*1/12=7.5 days

Answer 2

Mohan's (can do) = (12 days) 
Mohan's (1day) = 1/12 (work)
Sohan's  = 60% ( more efficient then Mohan) 
Sohan's (1 day ) = 1/12 + 60/100x(1/12)  (work) 
                         = 1/12 + 6/10X1/12
                         = 1/12 + 1/20 =(5+3)/60 = 8/60 = 2/15
 Sohan's (1 day ) = 1/7.5 (work) 
Sohan's  (7.5) day = 1 (finish the work)