Trei numere- a,b,c
a+b+c 2
---------=31 --
3 3
2 31×3+2 94
31----=-----------=----
3 3 3
a+b+c 94
--------=------
3 3
a=b:2
c=b+5
b:2+b+b+5 94
----------------=----- (Pentru ca avem ace-
3 3
lasi numitor ,îi tăiem)
b:2+b+b+5=94
b+b+b=94:2-5
3b=42
b=42:3
b=14
a=14:2
=7
c=14+5
=19
