Question

afla numarul x va rog frumos !

Answer 1

12:x=16:8
12:x=2
x=12:2
x=6


x*10 = 80:2
x*10=40
x=40:10
x=4

x+x=245+x
2x=245+x
2x-x=245
x=245

Answer 2

$c.\quad 12:x = 16:8 \Rightarrow 12:x = 2 \Rightarrow 12 = 2\times x \Rightarrow x = 12:2 \Rightarrow \boxed{x = 6}\\\\~ \quad x\times 10=80:2 \Rightarrow x \times 10 = 40 \Rightarrow x = 40:10 \Rightarrow \boxed{x = 4}\\ \\ ~\quad x+x = 245 +x \Rightarrow 2x - x = 245 \Rightarrow \boxed{x=245}$