 
<translate> Yawan 'yan mata a cikin aji shine 20 * 40% = 8' yan mata. Kafin sabbin yara maza su shiga, yawan yara maza a cikin aji shine 20 - 8 = yara maza 12. Idan sabbin yara maza 5 suka shiga, sabon adadin yara maza shine 12 + 5 = yara maza 17 kuma sabon jimlar shine 20 + 5 = 25 jimlar mutane. Sabon kashi na 'yan mata a cikin aji shine' yan mata 8 / 25 duka mutane = 32%. Amsar ƙarshe: 32. <eng> 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. 