Jim, Sandra and ken went to a library together.The air-conditioner was turned on in the library.
Jim who stand in the left hand side : It is cold here. I guess the temperature is below 20℃.
Sandra who stand in the middle :Really? But I feel a bit hot instead. The temperature here should be higher than 20℃.
Ken who stand in the right hand side: I agree with Sandra.
(a) Based on their conversations, do you know whether the temperature in the library is higher lower than 20℃? Why?