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?

Correct result:

V =  80 l

Solution:

 V/2+20=3/4 V  V=80=80 l



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