Umurbaba

9 and 0 was what we all think it was but the answer is quite interestingly 8221 I have the question as a pdf file but sadly it is in Turkish. But translate is accurate as me and my English teacher have checked it

By the way this was from a math exam. In couple of days they should declare the correct answer.They are still saying there is one unique answer no matter how many times I asked them

Here is the real challenge. After John says I am done, Jack should find the number. Also as James said John didnt know the number. But John came to this conclusion by Jack and James's comments. Also there is only one true answer. If the sum is 1 then the olny number is 1000

Sorry my bad. a>=b>=c>=d. You should find the 4 digit number

There is a 4 digit number which spells like "abcd". Jack, John and James tries to find this number. Jack only know the range of the digits(biggest -smallest).John only knows a+b+c+d.James knows a*b*c*d. Jack says: I dont know all the digits but James doesn't either. James says: I dont know all the digits but John doesnt either. John says: I just found it and Jack should be just found it as well. What is the four digits ?

There is a 4 digit number which spells like "abcd". Jack, John and James tries to find this number. Jack only know the range of the digits(biggest -smallest).John only knows a+b+c+d.James knows a*b*c*d. Jack says: I dont know all the digits but James doesn't either. James says: I dont know all the digits but John doesnt either. John says: I just found it and Jack should be just found it as well. What is the four digits ?