Question

Ma a numerelor este 9,10,15,14 si x este 12.Aflati numarul x

Answer 1

9+10+15+14 supra 12=38:4

Answer 2

$m _{a} =(9+10+15+14+x):5=12$
$9+10+15+14+x=12*5$ 
$48+x=60$
$x=60-48$
$x=12$