 
<translate> Ya yanke itace 2 * 20 = 40 da kansa. Kowane ɗayan 'yan'uwansa ya yanke itace 20 *.2 = 4 ƙasa da itace kowace rana. Saboda haka kowannensu ya sare itatuwa 20 - 4 = 16. Don haka a cikin kwanaki 3 masu zuwa suka sare itatuwa 20 + 16 * 2 = 52 kowace rana. Saboda haka suka sare itatuwa 40 + 52 * 3 = 196. Saboda haka, amsar ita ce 196. <eng> He cuts down 2 * 20 = 40 trees by himself. Each of his brothers cuts down 20 * .2 = 4 fewer trees per day. So they each cut down 20 - 4 = 16 trees. So for the next 3 days they cut down 20 + 16 * 2 = 52 trees per day. So they cut down 40 + 52 * 3 = 196 trees.
Therefore, the answer is 196. 