Weighted Balls

If belonging to 10 species of each kind of balls numbered 10 pieces. Given the nine types of balls have the same weight of 1 gram, while one type of ball has a weight of 1.1 grams. How can we know what different types of balls when we

Drinked Drugs

A patient who is very ill to go to the doctor to check the disease. After meeting the doctor, he was given a very potent drug. But the drug must be taken on time as recommended. Doctor