Eggs

Mother bought from neighbors 39 domestic eggs. Her neighbor got back €4.54 from €10. How many euros get back from 20 banknote if she buy 94 eggs from a neighbor?

Correct result:

x =  6.84 Eur

Solution:

$$\begin{gathered} p=(10-4.54)\mathrm{/}39=0.14Eur \\ x=20-94p=6.84\text{ Eur} \end{gathered}$$

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