x-nr de bomboane ale Mariei
y-nr de bomboane ale Ioanei
y-5=x/4
x-10=y/4
x=y/4+10
y-5=(y/4+10)/4 aducem la acelasi numitor in (....)
y-5= (y+40)/4 /4
y-5=(y+40)/4 * 1/4
y-5=(y+40)/16 aducem la acelasi numitor
16y- 80= y+40
16y-y=40+80
15y=120
y=8
x=8/4 +10= 2=10=12