Average weight of 5 boys is 65kg, average weight of 4 girls is 56kg. What is the average weight of all 9 kids?

May 31, 2018

61

Explanation:

"Average weight of 5 boys is 65kg"
The total weight of the 5 boys can be found as $65 \times 5 = 325$

"Average weight of 4 girls is 56kg"
The total weight of the 4 girls can be found as $56 \times 4 = 224$

The average can then be found as $\frac{325 + 224}{4 + 5} = \frac{549}{9} = 61$