Question:
Add 9 + 1. Then mulitply 9 x 1. Do you get the same answer each time?
Answer:
No. 9 + 1 = 10 and 9 x 1 = 9.
Try another Brain Teaser:
Jack tells Jill, "This isn't the $5 bill you left on the the table. I found it between pages 15 and 16 of Harry Potter."
Jill retorts, "You're lying and I can prove it." How did Jill know?