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3 stilouri valoreaza cat 6 pixuri .7 pixuri costa 35 lei .2 stilouri =?lei
ce aflam prima oara?


Răspuns :

15 lei costa 2 stilouri
3 stilouri=6 pixuri.
.7pixuri=35 lei
aflam cat costa 1 pix.
35:7=5 lei costa 1 pix
3 stilouri=6x5=30 lei
aflam cat costa 1 stilou .
30:3=10 lei costa 1 stilou
aflam cat costa 2 stilouri .
2x10=20 lei
r: 2 stilouri=20 lei