Question

media aritmetica a nr 8 si x este 15 determinati x

Answer 1

[tex] \frac{8+x}{2} = 15 =>\\8+x=15*2 \\ 8+x = 30 \\ x=30-8 \\ x=22 [/tex] 

Proba

$\frac{8+22}{2} = 30 : 2 = 15$

Answer 2

(8+x):2=15
8+x=15 ori 2 =30
x=30-8
X=22