 
<translate> Tankin na biyu da na uku kowannensu yana da kifi 20 * 2 = 40. Saboda haka a cikin duka akwai 20 + 40 * 2 = 100 kifi. Amsar ita ce: 100. <eng> The second and third tank each have 20 * 2 = 40 fish. So in total there are 20 + 40 * 2 = 100 fish.
The answer: 100. 