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And her true age is... (Posted on 2010-10-14) Difficulty: 2 of 5
No one of us knew the age of Lisa, our math teacher, and the six guesses were as follows:
34,47,48,53,30 and 40.
When confronted with this list , Lisa joyfully said:
I will not disclose my age explicitly, but I let you know that all of you erred.
Your estimates were off by: 2,6,11,12,8,5.

Well, it took some reasoning to get her true age.

What was it?

See The Solution Submitted by Ady TZIDON    
Rating: 2.5000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution But she tells everyone she's 29... | Comment 1 of 3
The range of the students' guesses is 53 - 30, or 23. Since neither "student 30" nor "student 53" was off by more than 11 or 12, Lisa's age must fall within this range -- specifically, she's either 41 or 42. The closest guess was off by 2; this must be "student 40." So Lisa is 42 years old!
  Posted by Jyqm on 2010-10-14 13:19:49
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