 <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. <yor> Ní wákàtí kejì, iye aṣọ ìnura tí wọ́n pín jáde jẹ́ 50 x 1.20 = 60. Ní wákàtí kẹta, iye aṣọ ìnura tí wọ́n pín jáde jẹ́ 60 x 1.25 = 75. Ní wákàtí kẹrin, ìdá kan nínú mẹ́ta àwọn àlejò wákàtí kẹta ni 75 / 3 = 25. Ní wákàtí kẹrin, iye aṣọ ìnura tí wọ́n pín jáde jẹ́ 75 + 25 = 100. Gbogbo wọn lápapọ̀, títí kan àwọn àlejò wákàtí àkọ́kọ́, iye tó yẹ kí wọ́n fọ ni: 50 + 60 + 75 + 100 = 285. Nítorí náà, ìdáhùn náà ni 285. 