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19-03-2022
Mathematics

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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?

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19-03-2022

Answer:

10

Step-by-step explanation

[tex]\frac{a+b}{2}=20\\\frac{b+c}{2}=24\\ \frac{a+b+c}3}=18\\[/tex]

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

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