PROBLEMA 12.
175+25=200 copii Anglia
200:2= 100 copii Germania
175+200+100+475 ( Franta+Anglia+Germania )
700-475= 225 copii Romania
PROBLEMA 13.
a+b+c=500
a+b=325
b+c+338
c= 500-325
c= 175
a= 500-338
a= 112
162+b+175=500 VERIFICARE: 162+163+175=
337+b=500 325+175= 500
b= 500-337
b= 163