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Doi soricei mananca o bucata de branza in 12 zile.
Cati soricei vor termina bucata de branza in 3 zile?
In cate zile vor manca bucata 4 soricei?


Răspuns :

Patru soricei in 6 zile si 6 soricei in 3 zile
2...................12
x...........3
2/3 =x/12
x =24/3
x=8 soricei
8............3
4..............x
8/4=x/3
x=24/4
x=6 zile