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bianca si beatrice au impreuna 36 timbre.Cate timbre are fiecare,stii.d ca bianca are cu 20 mai putine.

Răspuns :

36-20=16
16:2=8 are Bianca
20+8=28 Beatrice
Bianca=|----|. Beatrice=|----|+20|. 36-20=16. 16:2=8 (timbrele Biancai). 8+20=28 (timbrele lui Beatrice). Verificare: 28+8=36.