 
<translate> Ọ na-egbutu osisi 2 * 20 = 40 n'onwe ya. Nke ọ bụla n'ime ụmụnne ya na-egbutu osisi 20 *.2 = osisi 4 kwa ụbọchị. Ya mere, onye ọ bụla n'ime ha gbuturu osisi iri abụọ - anọ = osisi iri na isii. N'ihi ya, n'ime ụbọchị atọ sochirinụ, ha gbuturu osisi 20 + 16 * 2 = 52 kwa ụbọchị. Ya mere, ha gbuturu osisi 40+52*3=196. N'ihi ya, azịza ya bụ 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. 