Maria /___/___/___/___/___/___/___/___/___/___/
Dan /___/
Daca Maria ii da lui Dan 30 carti :
Maria /___/___/___/___/___/___/___/___/ - 30
Dan /___/ ... 30 ..
Maria /___/___/___/___/....120....
De 4 ori mai multe decit Dan inseamna 4 segmente + 4 * 30
5 segmente - 30 = 120
5 segmente = 150
150 : 5 = 30 ( un segment )
Maria are 9 * 30 = 270
Dan are 30