Nádoba

Nádoba tvaru kostky je naplněna vodou do poloviny své výšky. Pokud dolijeme 20 l vody, bude nádoba naplněna do tří čtvrtin své výšky. Jaký je objem celé nádoby?

Result

V =  80 l

Solution:

 V/2+20=3/4 V  V=80  V=80 =80 l \ \\ V/2 + 20=3/4 \cdot \ V \ \\ \ \\ V=80 \ \\ \ \\ V=80 \ \\ =80 \ \text{l}



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