There are 25 boys in a five-year class, and 2 girls are less than boys. What's the number of girls? What's the number of boys? What's the number of boys? The formula is also important

The number of female students is 25-2 = 23,
The number of female students is 23 / 25 of that of male students,
The total number of students in the class is 23 + 25 = 48, so the number of boys is 25 / 48 of the total number of students in the class

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