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Question

Answer

If there were u chickens, there were (150 – u) cows.

Given

2u – 4( 150 – u) = 210

2u – 600 + 4u = 210

6u = 810

u = 135

so there were 135 chickens.

Check: 135 * 2 – 4 * 15 = 270 – 60 = 210 checked.

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