The ratio of the number of girls to the number of the boys in a class is 2:3. If total number of the students in the class is 45, then the number of the boys is:
Total number of the students = 45
Ratio of number of girls to the number of boys = 2 : 3
Let the number of girls in the class be 2x and number of boys be 3x
According to the statement
2x + 3x = 45
5x = 45
x = 9
So, the number of the boys in the class = 3x = 3(9) = 27