iNTELLIGENCE

IQ solution to: Drying Wine Grapes

The water content of the grapes decreased to 98 %, therefore the dry matter increased to:

dry matter = 100 % - 98 % = 2 %. The dry matter is still 1 kg (at the beginning, the dry matter was 100 % - 99 % = 1 %, corresponding to 1 kg).

Hence, the total weight of the grapes is 1 kg × (100 % ÷ 2 %) = 50 kg.

It sounds paradoxical but to reduce the water content of the grapes by 1 %, it was necessary to evaporate 50 kg of water, i.e. half of the original grapes’ weight!

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