Răspuns :
a - I nr
b - II nr
a + b = 80
20a/100 = 30b/100
20a = 30b
2a = 3b
a/b = 3/2 => raportul numerelor
a = 3b/2
a + b = 80
3b/2+b=80
3b+2b=160
5b=160
b = 160:5
b = 32
a = 3b/2 = 32x3/2= 96/2 = 48
48 + 32 = 80
48/32 = 3/2
b - II nr
a + b = 80
20a/100 = 30b/100
20a = 30b
2a = 3b
a/b = 3/2 => raportul numerelor
a = 3b/2
a + b = 80
3b/2+b=80
3b+2b=160
5b=160
b = 160:5
b = 32
a = 3b/2 = 32x3/2= 96/2 = 48
48 + 32 = 80
48/32 = 3/2