Răspuns:
a/3=b/4 => 3b=4a
a+b=63/×3 => 3a+3b=189
7a=189
a=27
27+b=63/-27
b=36
a+b=63
a/3=b/4=k
a=3k
b=4k
3k+4k=63
7k=63
k=63:7
k=9
a=3×9
b=4×9
