The number of students in the three sections of a class are in the ratio 2:3:4. The average marks scored in each of these sections is in the ratio 4:3:1. By what percent is the average mark of the second section more than the class average?	Answers
A) 23.27%	B) 28.57%	C) 32.38%	D) 36.74%	E) 38.74%
Let the number of students be 2x, 3x, 4x.   Let the average marks be 4y,3y,y.   Average mark of class = ( 8xy+9xy+4xy)/(2x+3x+4x)   =21xy/9x=7y/3   Percentage difference = ( 3y - 7y/3)/7y/3 *100   = 28.57%   ANSWER:28.57%
<result>B</result>
The number of students in the three sections of a class are in the ratio 2:3:4. The average marks scored in each of these sections is in the ratio 4:3:1. By what percent is the average mark of the second section more than the class average?