# Cows

20 cows has food for 60 days. We reduce the dose to two-thirds for 18 cows. How many days will be fed?

Correct result:

x =  85.7143

#### Solution:

20•60 = 18• (2/3)•x + 2x

20•60 = 18• (2/3)•x + 2•x

42x = 3600

x = 600/7 ≈ 85.714286

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