In a class, if 50% of the boys were girls, then there would be 50% more girls than boys. What percentage of the overall class is girls? Choose the correct choice from the following answers: A) 25 % B) 33.33 % C) 40 % D) 20 % E) 10 %

Rationale: detailed solution for questions of this type , it is best to go from the final step . in the final state , the number of girls should be 1.5 * the number of boys . when 50 % of the boys are taken as girls , let the number of boys = x number of girls = 1.5 x total number of students = 2.5 x original number of boys = 2 x ( 50 % of boys = x ) original number of girls = 0.5 x girls form 20 % of the overall class . correct answer d .
Answer: D