Răspuns :
a+b=172
a=bx3
bx3+b=172
bx4=172
b=172:4
b=43
a+43=172
a=172-43
a=129
verificare. 43x3=129
a=bx3
bx3+b=172
bx4=172
b=172:4
b=43
a+43=172
a=172-43
a=129
verificare. 43x3=129
P |-------|
M|-------|-------|-------|
cati peri sunt?
172:4=43
cati meri sunt?
43×3=129