Explicación paso a paso:
[tex] \frac{10 + 15 + 12 + 10 + x}{5} = 13.4[/tex]
47+x=67
x=20
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Explicación paso a paso:
[tex] \frac{10 + 15 + 12 + 10 + x}{5} = 13.4[/tex]
47+x=67
x=20