Tuesday, February 1, 2011

A Trick Question

Added together a bat and a ball cost a $1.10 in total. BY ITSELF, the bat costs $1.00 MORE than the ball. So how much does the ball cost BY ITSELF?

5c, because $1.05 is $1.00 more than the ball, and 5c and a $1.05 equals $1.10.

This question doesn't weigh so much on our intuition as on our tendency to read this as a simple subtraction problem and so come up with 10c rather than 5c for the cost of the ball.

B

No comments:

Post a Comment