1.

In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the averageweight of the boys of the class?1). 722). 733). 694). 71

Answer»

option 4 is the correct answer as per the answer key

TOTAL NUMBER PF students = 66 

number of girls = 33
number of boys = 66 - 33 = 33
Average weight of girls = 61
=> total weight of girls = 33 * 61 = 2013 kg
=> Total weight of all students = 66 * 66 = 4356 kg
=>total weight of boys = 4356 - 2013 = 2343 kg
average weight of boys = 2343/33 = 71 kg.


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