In a class of 60 students, there are 33 girls. The average weight of these girls is 62kg and the average weight of the full class is 66.5kg. What is the average weight of the boys of the class?
- A72kg
- B71kg
- C70kg
- D73kg
Solution & Step-by-step Explanation
Given parameters:
Total students = 60
Number of girls = 33
Number of boys = 60−33=27
Calculate the total weight of the entire class:
Total weight of class=60×66.5=3990kg
Calculate the total weight of the girls:
Total weight of girls=33×62=2046kg
Find the total weight of the boys by subtraction:
Total weight of boys=3990−2046=1944kg
Calculate the average weight of the boys:
Average weight of boys=
27
1944
=72kg
Total students = 60
Number of girls = 33
Number of boys = 60−33=27
Calculate the total weight of the entire class:
Total weight of class=60×66.5=3990kg
Calculate the total weight of the girls:
Total weight of girls=33×62=2046kg
Find the total weight of the boys by subtraction:
Total weight of boys=3990−2046=1944kg
Calculate the average weight of the boys:
Average weight of boys=
27
1944
=72kg