Czech crowns

Oldrich has one crown. Peter has five crowns coin, a two crown coin and a one-crown coin. Radek has twenty-crown banknote, ten banknote and five-crown coin. The boys got one fifty-one crown and one crown coin. How can they share the money fairly when they can not change the coins?

Correct result:

x =  17 Kc

Solution:

$$\begin{gathered} a=50+1=51 \\ x=a\mathrm{/}3=51\mathrm{/}3=17=17\text{ Kc } \\ {O}_1=1 \\ {P}_1=5+2+1=8 \\ {R}_1=20+10+5=35 \end{gathered}$$

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