x=nr probleme
0,(3)x=x/3= saptamana 1
x-x/3=2x/3=rest
2x/3 ×0,(6)=2x/3×2/3=4x/9=saptamana 2
2x/3-4x/9=2x/9=rest
2x/9×1/2=x/9=saptamana 3
x/3+4x/9+x/9+10=x
3x+4x+x+90=9x
x=90 probleme
x/3=90/3=30 probleme saptamana 1
4x/9=4×90/9=40 probleme saptamana 2
x/9=90/9=10 probleme saptamana 3
10 probleme saptamana 4