Class B has 50% more students than class A. Number of girls in class A is equal to number of boys in class B. The percentage of girls is the same in both classes.What percentage of the student group are boys?

percentage of the student group are boys is (Ab+Bb)/(A+B) =>(A-Ag+Bb)/(A+1.5A)=>(A-Ag+Ag)/2.5A (Since 2nd condition Ag=Bb); A/2.5A =>0.4 or 40% in percentage terms

40% of boys in total group of students (class A and Class B combined) Solution:-B (number of students in class B) = 1.5 A (number of students in class A); Ag (Girls students in class A) =Bb(Boys in class B); Ag/A=Bg/B by solving we get 40%