Twenty cows have food for 60 days. We reduce the dose to two-thirds for 18 cows. How many days will it feed?

Correct answer:

x =  85.7143

Step-by-step explanation:

20·60 = 18· (2/3)·x + 2x

20·60 = 18· (2/3)·x + 2·x

42x = 3600

x = 3600/42 = 85.71428571

x = 600/7 ≈ 85.714286

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