# [Numeracy 462] Re: Monday Puzzle

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McIntosh, Tricia tmcintos at ghc.edu
Tue Aug 3 16:31:48 EDT 2010

Tricia McIntosh
I-BEST Facilitator/Instructor
http://ghc.ctc.edu/voc/ibest.htm
360-533-9448
________________________________________
From: numeracy-bounces at nifl.gov [numeracy-bounces at nifl.gov] on behalf of Ladnor Geissinger [ladnor at email.unc.edu]
Sent: Tuesday, August 03, 2010 9:15 AM
To: The Math and Numeracy Discussion List
Subject: [Numeracy 456] Re: Monday Puzzle

Oh please, don't ever write such an obviously incorrect equation for
your students, and don't let them write things like that! No wonder
they think math is confusing and makes no sense.
30 - 3 =27 and 27 - 2 =25 are both correct of course, but 30 - 3 = 27
- 2 is clearly wrong.

Given two numerical expressions expr1 and expr2, when we write the
shorthand sentence " expr1 = expr2 " we mean that if, or when, you
evaluate both expressions then the resulting numbers are in fact the same.
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On 8/3/2010 10:28 AM, McIntosh, Tricia wrote:

> \$30 - \$3 = \$27 - \$2 = \$25

>

> orig. amt - money returned = charged amt - pocketed amt from the over charge = cost of room

>

> Tricia McIntosh

> I-BEST Facilitator/Instructor

> http://ghc.ctc.edu/voc/ibest.htm

> 360-533-9448

> ________________________________

> From: numeracy-bounces at nifl.gov [numeracy-bounces at nifl.gov] on behalf of Istas, Brooke [IstasB at cowley.edu]

> Sent: Monday, August 02, 2010 3:11 PM

> To: numeracy at nifl.gov

> Subject: [Numeracy 448] Monday Puzzle

>

> Three men go to a motel to rent a room for the night. The manager is not there so the bellhop waits on them. He doesn’t know how much the room is so he decides to charge them \$10 per person making the total cost for the room \$30 dollars. When the manager returns, the bellhop tells the manager what he did. The manager tells the bellhop that the room is not that much and gives \$5 dollars back to the bellhop to give to the men. On the bellhop’s way to the room, he thinks about the trouble of dividing \$5 dollars among the three men so he puts \$2 in his pocket and gives each man in the motel room \$1 dollar back. Now, if they each paid \$9 for their room, 3 X \$9 = \$27 plus the \$2 the bellhop put in his pocket equals \$29 dollars. What happened to the other \$1 dollar?

>

> If you figure this riddle out, please reply with your answer and explanation. Good Luck this one is tricky but my adult learners love these types of activities.

> Happy Monday!

>

> Brooke Istas

>

>

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