In class of 30 students 14 are boys. If 2 boys drop out of the class and 2 girls are added what fraction of the class will be boys

14/30 = amount of boys

(14-2) / 30

12/30=new amount

16/30 = original amount of girls

(16+2) / 30=new amount of girls

12/30=6/15=2/5

2/5 is your answer

30 students ... 14 are boys ... that means (30 - 14) = 16 are girls

if 2 boys are dropped ... 14 - 2 = 12 boys

and 2 girls are added ... 16 + 2 = 18 girls

fraction of the class that are boys is : 12/30 which reduces to 2/5 <==