Motor oil

30 liters of oil cost 28.80 Euros. How much cost a liter?

Correct result:

x =  0.96 Eur

Solution:

$x=28.80\mathrm{/}30={\displaystyle \frac{24}{25}}={\displaystyle \frac{24}{25}}\text{ Eur}=0.96\text{ Eur}$

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