Răspuns :
a+b= 60
b=5×a
a+5×a =60
6×a = 60 | :6
a = 10
b = 60-10
b = 50
verificare:
10+50=60
b=5×a
a+5×a =60
6×a = 60 | :6
a = 10
b = 60-10
b = 50
verificare:
10+50=60