The Cucumber Case
In the morning, the 200 kilograms of cucumbers are 99% water.
Therefore, the non-water part of the cucumbers has a mass of 2 kilograms.
At the end of the day, the cucumbers are 98% water.
The remaining 2% is still the 2 kilograms of non-water material
(which does not change when the water evaporates).
If 2% equals 2 kilograms, then 100% equals 100 kilograms.
Consequently, the greengrocer has 100 kilograms of cucumbers left at the end of the day.
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