Respuesta :

brncomondi

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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