fixing issue #198

[coco3427]

I made some changes in order for the question to make sense. I looks like in the current version of the book the code had been updated , but the question had not been updated to match. the variable names and hard coded values needed to change, and therefore the text needed to change to match.

Please look over my changes to make sure I didn't miss anything. let me know of any necessary changes I need to make.