Question

- in a class of 39 students there are 26 girls. the average weight of these girls is 42 kgs and average weight of the full class is 48 kgs. what is the average weight (in kgs) of the boys of the class?

Answer 1

total weight of the class=39*48=1872
total weight of girls=26*42=1092
total weight of boys=1872-1092=780
average weight of boys=780/13=60