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答The first step in solving this problem is to calculate the total number of students in the class. Since there are 20 boys and 30 girls, the total number of students is 20 + 30 = <<20+30=50>>50 students.Next, we need to find the percentage of boys in the class. To do this, we divide the number of boys by the total number of students and multiply by 100. So, the percentage of boys is (20/50) * 100 = 40%.Therefore, the answer is 40%.
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