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100dag:23%=23dag
54:23%=12,84dag
154dag+(12,84+23)=189,84dag
Odp.: Potrzeba 189,84dag aby uzyskać 154dag jabłek suszonych
x-123%
x=154dag*123%
--------------
100%
x=189.42dag
154-77%
x-100%
x=100*154//77
x=15400//77
x=200 dkg.
Odp. Nalezy zgromadzić 200 dkg.