The first step is to determine how many units of 3 boys and 2 girls are in the class. This can be done by adding 3 and 2, which gives us 5, and dividing 50 by that number. This equates to 10.
Now we can multiply 10 by the respective numbers in the ratio for each total value.
10 x 3 = 30
10 x 2 = 20
Therefore the answers are 30 boys and 20 girls.
Hope this helps!