10. Teacher Xiao Zhou wrote down a two-digit prime number, and told the unit digit to Jia, the tens digit to Yi, the sum of the tens and unit digits to Bing, and the difference between the tens and unit digits (the larger minus the smaller) to Ding.
Bing said: Before I spoke, Jia must have thought that Yi didn't know what the prime number was.
After Bing spoke, Yi said: Before I spoke, Jia must have thought that Ding didn't know what the prime number was. Therefore, the prime number is
. (Jia, Yi, Bing, and Ding are all honest and intelligent)
匹答案】23

Match answer】23