Răspuns:
a+b=120
a-b=20 => a=b+20
a .___.+20
b .___.
120-20=100(două părți egale)
100÷2= 50(b)
50+20=70(a)
V: 70+50=120
a+b=150
a=b+50
a.__.+50
b.__.
150-50=100
100÷2=50(b)
50+50=100(a)
V:100+50=150
a+b=105
a÷b=20 => a=20b
a.__.__.__.__.__.__.__.__.__.__.__.__.__.__.__.__.__.__.__.__.
b.__.
105÷21=5(o parte egală), (b)
5×20=100(a)
V:100+5=105
Sper că te-am ajutat!
