Guess and Check #2
Mary visited the shopping mall. She bought a scarf for $5.00, spent
1/2 of her remaining money on
jogging shoes, bought lunch for $2.00 , then spent 1/2 of her remaining
money on a CD. She had $10.00 left. How much did she start with? (Also,
how much did the jogging shoes and the CD cost?)
There are many approaches to this problem - one
is to guess at how much money Mary started with, and then work out
how much she would have left based on your guess. Then adjust your
guess if she ends up with more or less than $10. Another approach
might be to work backwards from the $10 she had left.
As always, be sure to explain the work you did to arrive
at your answer!