Question

Media aritmetica a numerelor 8, 12, si x este 11 . Aflati nr x
Va roooog

Answer 1

$\frac{8+12+x}{3} =11$
$8+12+x=11*3$
$20+x=33$
$x=33-20$
$x=13$

Answer 2

$m_a=(8+12+x)\div3 \\ \\ 11=(20+x)\div3 \\ \\ 20+x=11\cdot3 \\ \\ 20+x=33 \\ \\ x=33-20 \\ \\ x=13$