# [Numeracy 459] Re: Monday Puzzle

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Chip Burkitt chip.burkitt at orderingchaos.com
Tue Aug 3 13:20:25 EDT 2010

Good point. Several programming languages also use the equal sign as
an assignment operator. This can also be confusing. For example, the
statement
x = x + 1
means "add one to the current value of x and store the result in x." For
algorithms, many prefer
x ← x + 1

Chip Burkitt

On 8/3/2010 11:15 AM, Ladnor Geissinger wrote:

> 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.

> ---------------------------------------------------------------------------------------------------------------------

> 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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>>

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