Who is the youngest of the three?

21.
W: Jack is younger than Kate.
M: But he is older than Mike.
   22.
W: That was such an interesting movie! I hope you enjoy it as much as
   I did.
M: I must admit that I fell asleep after the first thirty minutes.
   23.
W: I’d like to change 100 pounds for some Chinese money.
M: Yes. Er... that’ s 1500 yuan... Here you are.
   24.
W: Do you often call your parents?
M: I’ m too busy, so I only call them once a week.
   25.
W: How do you like the group work in Professor Zhang’ s class?
M: Oh, we all enjoy it. You know, we learn from each other by doing things together.