Do skladu stavebného materialu priviezli ráno niekoľko ton piesku. Prvý zákazník Adamík z neho odviezol päť šestin. Druhý zákazník Biely kúpil dve tretiny zo zvyšku a posledný zákazník Certis si odviezol tri pätiny zo zvyšku. Večer ostalo v sklade 80kg piesku. Koľko ton piesku bolo ráno v sklade? Koľko kilogramov piesku si kúpili jednotliví zákazníci?
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