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Let the weight of the container be C and the weight of water when fully filled be W.

Then C + W = 36 and C + w/2 = 21

Subtracting the second equation from the first gives w/2 = 36 - 21 = 15

Then W = 2 x 15 = 30 : As C + W = 36 then C = 36 - W = 36 - 30 = 6 kg.

The empty container weighs 6 kg.

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Q: What will be the weight of the empty container if the fully water filled container weighs 36 kg and the half water filled container weighs 21 kg?
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