Question

Jonathan's class has 30 boys. Of the students in his class, 60% are girls. How many girls are in Jonathan's class

Answer 1

If 60% are girls, the ratio girls to boys is

... girls : boys = 60% : 40% = 3 : 2

This means the number of girls is 3/2 times the number of boys:

... (3/2)*30 = 45

There are 45 girls in Jonathan's class.