Răspuns :
[tex]2a = \frac{a}{3} + 40[/tex]
[tex]2a - \frac{a}{3} = 40[/tex]
[tex] \frac{6a}{3} - \frac{a}{3} = 40[/tex]
[tex] \frac{5a}{3} = 40[/tex]
[tex]a = \frac{3 \times 40}{5} = 3 \times 8 = 24[/tex]
Explicație pas cu pas:
nr-x
2•x=40+1/3•x
2x-x/3=40
6x/3-x/3=40
5x=40•3
5x=120
x=24
coroana ? =)