12/5=x/20
240=5x
5x=240
x=240÷5
x=48
Răspuns:
[tex] \frac{12}{5} = \frac{ x}{20 } \\ inmultim \: pe \: diagonala \\ 240 = 5x \\ inversam \: partile \\ 5x = 240 \\ x = 240 \div 5 \\ x = 48[/tex]
