Question

6. If the mean of A and B is 20, the mean of B and C is 24 and the mean of A, B and C is 18. What is the mean of A and c?​

Answer 1

10

Explanation

`(a+b)/(2)=20\\(b+c)/(2)=24\\ \frac{a+b+c}3}=18\\`

20x2 = 40 -> a+b=40

24x2 = 48 -> b+c=48

18x3 = 54 -> a+b+c=54

solve the equations...

a=6

b=34

c=14

a+c/2 = 6+14/2 = 10