 
 <translate> In the second hour, the number of towels given out is 50 x 1.20 = 60. In the third hour, the number of towels given out is 60 x 1.25 = 75. In the fourth hour, one - third of the guests of the third hour is 75 / 3 = 25. In the fourth hour, the number of towels given out is 75 + 25 = 100. In total, including the first hour guests, they need to wash this many towels: 50 + 60 + 75 + 100 = 285.
Therefore, the answer is 285. <ibo> N'awa nke abụọ, ọnụ ọgụgụ akwa nhicha ndị e kesara bụ 50 x 1.20 = 60. N'awa nke atọ, ọnụ ọgụgụ akwa nhicha e kesara bụ 60 x 1.25 = 75. N'awa nke anọ, otu ụzọ n'ụzọ atọ nke ndị ọbịa nke awa nke atọ bụ 75 / 3 = 25. N'awa nke anọ, ọnụ ọgụgụ akwa nhicha e kesara bụ 75 + 25 = 100. Na ngụkọta, gụnyere ndị ọbịa nke awa mbụ, ha kwesịrị ịsa ọtụtụ akwa nhicha ahụ: 50 + 60 + 75 + 100 = 285. N'ihi ya, azịza ya bụ 285. 