 
 <translate> Work done by all three of them in one day = 1/7 + 1/8 + 1/12 = 59/168
The number of days required = 168/59 = 2 50/59 days.
Thus, the answer is (A). <hau> Aikin da su uku suka yi a rana ɗaya = 1/7 + 1/8 + 1/12 = 59/168 Yawan kwanakin da ake bukata = 168/59 = 2 50/59 days. Saboda haka, amsar ita ce (A). 