Question 64

In a prep school, the average weight of 30 girls in a class among 50 students is 16 kg and that of the remaining students is 15.5 kg. What is the average weight of all the students in the class ?

Solution

Average weight of 30 girls = 16 kg

=> Total weight of 30 girls = $$16\times30=480$$ kg

Similarly, total weight of remaining $$(50-30=20)$$ boys = $$15.5\times20=310$$ kg

$$\therefore$$ Average weight of all the students in the class = $$\frac{(480+310)}{50}$$

= $$\frac{79}{5}=15.8$$ kg

=> Ans - (B)

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