1. nr tei plantati pe o singura parte ⇒ 24:6+1=6+1=7 tei 7 tei × 2= 14 tei ( fiind plantati pe ambele parti ale aleii
2. x-123= y-405 = z-326 x+y+z= 872 daca x-123=y-405 ⇒ x=y-405+123 ⇒x=y-282 iar z-326=y-405 ⇒ z=y-405+326 ⇒z=y-79 y-282+y+y-79=8723 y-361=872 3y=872+3613y=1233 ⇒y=1233÷3 ⇒y=411x-123=411-405 x-123=6 x=123+6 x=129 z-326=411-405 z-326=6 z=326+6 z=332