 <translate> The number of girls in the classroom is 20 * 40% = 8 girls. Before new boys join, the number of boys in the classroom is 20 - 8 = 12 boys. If 5 new boys join, the new number of boys is 12 + 5 = 17 boys and the new total is 20 + 5 = 25 total people. The new percentage of girls in the class is 8 girls / 25 total people = 32%.
The final answer: 32. <yor> Iye àwọn ọmọbìnrin nínú kíláàsì náà jẹ́ 20 * 40% = 8 ọmọbìnrin. Kí àwọn ọmọkùnrin tuntun tó wọlé, iye àwọn ọmọkùnrin tó wà ní kíláàsì náà jẹ́ 20 - 8 = 12 ọmọkùnrin. Ti awọn ọmọkunrin tuntun 5 ba darapọ mọ, nọmba tuntun ti awọn ọmọkunrin jẹ 12 + 5 = awọn ọmọkunrin 17 ati apapọ tuntun jẹ 20 + 5 = apapọ eniyan 25. Iwọn ogorun tuntun ti awọn ọmọbirin ni kilasi jẹ awọn ọmọbirin 8 / 25 lapapọ eniyan = 32%. Ìdáhùn tí wọ́n fún un níkẹyìn ni pé: 32. 