问题：Dr. Chen is organizing a number guessing game in h
Dr. Chen is organizing a number guessing game in his Math Problem Solving class. Three smart students Adam, Ben and Wukong are the participants. They need to find two numbers x and y, such that 1<x<y<10. Dr. Chen gives the sum x+y to Adam, the product xy to Ben and the sum x+y+xy to Wukong. The 3 students are asked to write down their answer if they know. But no one knows what x and y are. After knowing that no one knows the answer in the first round, all of the 3 students know the correct answer in the second round. What are these two numbers x and y? Show your reasoning.