Question 66
In a class, the average weight of 4 boys is 50 kg and the average weight of 4 girls is 40 kg. What is the average weight of all the 8 students taken together?
Solution
In a class, the average weight of 4 boys is 50 kg.
total weight of 4 boys = $$4\times50$$ = 200 kg
The average weight of 4 girls is 40 kg.
total weight of 4 girls = $$4\times40$$ = 160 kg
Average weight of all 8 students taken together = $$\frac{200+160}{4+4}$$
= $$\frac{360}{8}$$
= 45 kg
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