【单选题】听力原文:Once a thief stole a bag of Corn from a farmer's house. The farmer went to the judge and told him about this. The judge ordered all the people of the farm to come before him. He took many sticks ...
【单选题】A restaurant orders 150 kg of pumpkins from the farmer's market. The farmer fills the order with 23 pumpkins. The average mass of the first 20 pumpkins is 6.5 kg. What must be the minimum average mass...