Question

B={x|x apartine M5 si 8<x< 25

Answer 1

$B=\left \{ x\:|\:x\: \in\:M_{5} \: \:si \: \:8 < x < 25\right \}$

$8 < x < 25$

$x \: \in \: (8,25)$

$M_{5}=\left\{0,5,10,15,20,25,...\right\}$

$x \: \in \: M_{5} = > x \: \in \: \left \{ 10,15,20 \right \}$