Question

media aritmetica a nr 2,7 1,5 si x este 3 x = ?

Answer 1

[2,7+1,5+x]/3=3
⇒2,7+1,5+x=3·3
⇒2,7+1,5+x=9
⇒4,2+x=9
⇒x=9-4,2
⇒x=4,8;

Answer 2

$\frac{2,7+1,5+x}{3} =3=\ \textgreater \ 2,7+1,5+x=9$
$x=9-4,2=\ \textgreater \ x=4,8$