 
 <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. <ibo> Onu ogugu umu nwanyi n'ime ulo akwukwo bu 20 * 40% = umu nwanyi 8. Tupu ụmụ nwoke ọhụrụ abanye, ọnụọgụgụ ụmụ nwoke nọ n'ime klaasị ahụ bụ ụmụ nwoke 20 - 8 = 12. Ọ bụrụ na ụmụ nwoke ise esonye, ọnụ ọgụgụ ụmụ nwoke ọhụrụ bụ 12 + 5 = ụmụ nwoke 17 na ngụkọta ọhụrụ bụ 20 + 5 = mmadụ 25 n'ozuzu. Onu ogugu ohuru nke umu nwanyi na klas bu umu nwanyi 8 / 25 ndi mmadu = 32%. Azịza ikpeazụ ya bụ: 32. 