Răspuns :
(206-186):2=20:2=10
Andrei are 10 bile
Dan are 10+186=196 bile
196+10=206
/-----/ Andrei +186
/------/-----------------------------------------------------------------------------------------------/Dan
Andrei are 10 bile
Dan are 10+186=196 bile
196+10=206
/-----/ Andrei +186
/------/-----------------------------------------------------------------------------------------------/Dan
/.../+186
/.../
206-186=20
20:2=10
Dan=186+10=196 bile
Andrei 206-196=10 bile
/.../
206-186=20
20:2=10
Dan=186+10=196 bile
Andrei 206-196=10 bile