Question

class 20 girls and 15 boys the average weight of the class is 42 kg the average weight of the boys is 41.5kg what is the average weight of girls​

Answer 1

Answer:

41.5+x/2 = 42

41.5+x = 84

x = 84-41.5

x = 43.5

Answer 2

Answer:

[(20+15)×42 - 15×41.5] ÷ 20

[35×42-15×41.5]÷20

[1470-622.5]÷20

847.5÷20

=42.375