Question

a+b=50,b reprezintă doua treimi din a;a,b =?

Answer 1

a/---/---/---/
b/---/---/          } 50
50-suma a 5 segm egale
50:5=10 (1 segment)
a=3*10=30
b=2*10=20

Answer 2

a+b=50
b=2/3 din a, b=2a/3
a+2a/3=50
Aducem la numitor comun a=3a/3
3a/3+2a/3=50
5a/3=50
5a=50×3
5a=150
a=150:5
a=30

30+b=50
b=50-30
b=20

V: 30+20=50
b=2/3 din 30
b=2×30/3
b=60/3
b=20