1.

In a class of 56 students there are 21 girls. The average weight of these girls is 56 kg and average weight of the full class is 62.875 kg. What is the average weight of the boys of the class?1). 69.75 kg2). 72.5 kg3). 67 kg4). 65 kg

Answer»

Total weight of all STUDENTS = 56 × 62.875 = 3521 kg

Total weight of girls = 21 × 56 = 1176 kg

Total weight of boys = 3521 – 1176 = 2345 kg

AVERAGE weight of boys = 2345/(56 - 21) = 67 kg


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