Barrel 2

Empty barrel weighs 7 kg. When it filled with water up to 45% height, weighs 60 kg. How heavy is barrel full of water?

Correct result:

x =  124.8 kg

Solution:

$$\begin{gathered} 60=7+45\mathrm{/}100v \\ v=(60-7)\cdot 2.222=117.778kg \\ x=7+v=7+117.778=124.8\text{ kg} \end{gathered}$$

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