Three friends

John, Peter, and Pablo each carried a 24 liters bucket full of water down the hill. After they reached the bottom, John's bucket was only 3/4 full, Peter's bucket was 2/3 full, and Pablo's was 1/6 full.
How much liters of water did they spill altogether on their way down?

Correct result:

s =  34 l

Solution:

$$\begin{gathered} V=24\text{ l } \\ q={\displaystyle \frac{3}{4}}+{\displaystyle \frac{2}{3}}+{\displaystyle \frac{1}{6}}={\displaystyle \frac{19}{12}}\doteq 1.5833 \\ s=3\cdot V-V\cdot q=3\cdot 24-24\cdot 1.5833=34\text{ l} \end{gathered}$$

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