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?

Result

x =  124.8 kg

Solution:

60=7+45/100v v=(60−7)⋅2.222=117.778 kg  x=7+v=7+117.778=124.8 kg60 = 7 + 45/100 v \ \\ v = (60-7) \cdot 2.222 = 117.778 \ kg \ \\ \ \\ x = 7 + v = 7 + 117.778 = 124.8 \ \text{kg}

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