Răspunsuri

2014-10-07T18:53:49+03:00
Maria are 4 timbre si daca mai primeste 5 face 9 timbre.
Ioana are 7 timbre si daca mai primeste 2 timbre face 9.
2014-10-07T18:55:27+03:00
I = nr timnre Ioana
m = nr timbre Maria
i+m=11
m+5=i+2 => m=i-3 inlocuim in preima relatia => i+i-3=11 => 2i=14 =>i=7
7+m=11 => m=4
Maria are 4 timbre. 
Ioana are 7 timbre.