arithmetic - shekhar is thrice as good a workman as vinayak and together they finish a piece of work in 12 days in how many days will shekhar alone finish the work - skillgun

Solution: Let A = Shekhar, B = Vinayak.
(A's 1 day's work) : (B's 1 day's work) = 3 : 1
(A+B)'s 1 day's work = 1/12.
Divide 1/12 in the ratio 3 : 1.
.'. A's 1 day's work = (1/12 * 3/4) = 1/16.
hence, Shekhar alone can finish the work in 16 days.