13.
The number of boys weighing 50 Kg is :
In a class of 540 students, for every 9 girls there are 11 boys. The weight of students varies from 40 to 50 Kg. There are as many 44 Kg girls as there are 46 Kg boys and as many 40 Kg boys as 50 Kg girls. The number of 50 Kg boys is 35 more than that of 44 Kg girls while there are as many 44 Kg boys as 46 Kg girls. The ratio of 40 Kg boys and girls is 4:3 while that of 50 Kg girls and boys is 1:3.
The answer is:
A
