the average weight of 20 boys in a class is 160 kg and that of the remaining five boys weight is 50 kg find the average weight of all boys in the class
Answers
Answer:
Step-by-step explanation:
Given,
The average weight of 20 boys in a class is 260kg and that of the remaining 5 boys is 50 kg.
To find,
The average weight of all boys in the class.
Solution,
The average weight of 20 boys in a class is 160 kg this means all the 20 boys have a weight of 160 kg.
Therefore, the total sum of the weight of 20 students is ⇒ 160 × 20 = 3200kg.
The average weight of the remaining 5 boys is 50 kg each.
Therefore, the total sum of the weight of the remaining 5 students is ⇒ 50 × 5 = 250kg.
Now, we have to find the average weight of all boys in the class-
Total boys = 20 boys + 5 boys = 25 boys.
Total weight of all boys = 3200 kg + 250 kg = 3450 kg.
Therefore, the average weight of each boy in the class = (Total weight of all boys) / (Total number of boys).
⇒ Average = 3450 / 25 = 138 kg.
Therefore, the average weight of all boys in the class = 138 kg.