摘要：
In a certain shop, each kind of product has an integer price. For example, the price of a flower is 2 zorkmids (z) and the price of a vase is 5z. In o 阅读全文
摘要：
Farmer John has two types of cows: black Angus and white Jerseys. While marching 19 of their cows to market the other day, John's wife Farmeress Joann 阅读全文
摘要：
Farmer John owns a large number of fences that must be repaired annually. He traverses the fences by riding a horse along each and every one of them ( 阅读全文