 
 <translate> For every white duck there are 5 fish and there are 3 white ducks for a total of 5 * 3 = 15 fish. For every black duck there are 10 fish and there are 7 black ducks for a total of 10 * 7 = 70 fish. For every multicolored duck there are 12 fish and there are 6 multicolored ducks for a total of 12 * 6 = 72 fish. All total there are 15 + 70 + 72 = 157 fish in the lake.
Thus, the answer is 157. <hau> Ga kowane farin duck akwai kifi 5 kuma akwai farin ducks 3 don jimlar 5 * 3 = kifi 15. Ga kowane duck baki akwai kifi 10 kuma akwai ducks baki 7 don jimlar 10 * 7 = kifi 70. Ga kowane duck mai launuka da yawa akwai kifi 12 kuma akwai ducks 6 masu launuka iri-iri don jimlar 12 * 6 = kifi 72. Gabaɗaya akwai kifi 15 + 70 + 72 = 157 a cikin tafkin. Saboda haka, amsar ita ce 157. 