+845 In a store window, there was a box of berries having a total weight of 200 kg. The berries were 99% water, by weight. After two days in the sun, the water content of the berries was only 90%, by weight. What was the total weight of the berries after two days, in kg?
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You're starting with 200 kg of berries, and 99% of that is water.
Since they're 99% water, that means that there's 1% of solid matter.
1% of 200 kg means that there are 2 kg of solid matter.
Some of the water evaporates in the sun, but the solid matter doesn't.
So there still remains 2 kg of solid matter.
Since the new water content is 90%, that means that now the solid matter is 10%.
So 2 kg (the solid matter) is 10% of the total weight.
And if 10% of the total weight is 2 Kilograms, If you multiply that by 10, you get the answer,
20 kilograms
