In a class of 60 studnets 60% are girls. The average weight of boys is 60kg and that of the girls is 50 kg. What is the average weight (in kg) of the whole class?
Answer & explanation
Correct answer: option 3
60% = \(\frac{3}{5}\)
Boys : Girls
2 : 3
Average weight of class = \(\frac{(2\;×\;60) + (3\;×\;50)}{5}\)
= \(\frac{270}{5}\) = 54