Question

andrei si bogdan an 210 lei ,Daca Andrei ii da lu' Bodan o sesime ,atunci Bogdan va avea jumatate din suma ramasa lui Andrei,Cati lei are fiecare?

Answer 1

a=suma Andrei
b=suma Bogdan
a+b=210                  b=210-a
a-a/6=2×(b+a/6)
a-a/6=2×(210-a+a/6)
a-a/6=420-2a+a/3
3a-a/6-a/3=420
18a-a-2a=2520
15a=2520
a=168 lei  Andrei
b=210-168=42 lei Bogdan