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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?

 Jun 6, 2023
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0.99  x  200 ==198 kg - water by weight

200  -  198 ==2 kg - fruit by weight.

 

After drying up in the sun for two days, we have:

90% - water by weight

10% - fruit by weight

 

B ==weight of the berries

 

But fruit by weight ==2 kg. Therefore, we have:

10%B ==2 kg

0.10B == 2

B == 2 / 0.10 ==20 kg - weight of the berries after 2 days in the sun.

 Jun 6, 2023

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