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Question

Answer

If there were u cows, there were (100-u) chickens.

Given

4u – 2(100 – u ) = 220

4u – 200 + 2u = 220

6u = 420

u = 70

So there were 70 cows.

Check : 70 * 4 – 30 * 2 = 280 -60 = 220 checked.

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