Answer: 10. Listen closely: 30 cows, and twenty-eight chickens. Say EIGHT and ATE. They sound the same. Therefore, it means 20 ATE chickens. 30-20=10, so 10 cows didn't eat any chickens.
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10. Listen closely: 30 cows, and twenty-eight chickens. Say EIGHT and ATE. They sound the same. Therefore, it means 20 ATE chickens. 30-20=10, so 10 cows didn’t eat any chickens.