24masinute....36puzzle....1008lei
72masinute....27puzzle....1566lei

Ce suma va plati o gradinita care cumpara 39masinute si 50puzzle?


Răspuns :

24m....36p....1008lei  x3
72m....27p,,...1566lei

72m....108p...3024lei
72m....27p.....1566lei
/...........81p.....1458

1p=1458:81
1p=18
18x36=648
1008-648=360
1m=360:24
1m=15