Răspuns :
a=mere
b=pere
a=3b
(a+12)+(b+6)=42
(3b+12)+(b+6)=42
4b+18=42
4b=42-18
4b=24
b=24:4
b=6
a=6×3
a=18
mere=18
pere=6
b=pere
a=3b
(a+12)+(b+6)=42
(3b+12)+(b+6)=42
4b+18=42
4b=42-18
4b=24
b=24:4
b=6
a=6×3
a=18
mere=18
pere=6