The average weight of a class of 40 students is 30 kg and the average weight of a class of 20 students is 15 kg. Find the average weight of both the classes combined.
Answer & explanation
Correct answer: option 1
Total Weight = No. of students × Average
Class1 = 40 × 30 = 1200kg
Class2 = 20 × 15 = 300 kg
Average of both classes = \(\frac{Total\;weight}{Total\;no.}\)
⇒ \(\frac{1500}{60}\) = 25 kg