[Numeracy 473] Re: Puzzle/Thought of the Day
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Thu Aug 5 20:29:26 EDT 2010
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Your answer is correct. 841 is 29 x 29. Since 29 is a prime number,
there are no other possible factors of 841 (except 841 and 1, as you
noted). 29 cents requires 4 pennies and a coin that ends in 5, i. e.,
either a nickel or a quarter. If a quarter, then you would have only 5
coins. Therefore, it must be a nickel. The remaining 20 cents must be
made up of 4 coins, none of them pennies. No combination of nickels and
dimes will work except 4 nickels and no dimes.
Chip Burkitt
On 8/5/2010 1:26 PM, Mark.Trushkowsky at mail.cuny.edu wrote:
>
> This one was tricky for me.
>
> At first, I wasn't sure if the question could be answered without
> knowing the number of people in the group, until I figured that was
> probably part of the puzzle. I tried dividing $8.41 by possible
> numbers of people in the group and didn't find any numbers that went
> into $8.41 evenly until I got to 29 people. If there were 29 people,
> that would mean they each paid .29 cents. After some trial and error
> with dimes, nickels and pennies, I realized the only way to get that
> amount with nine coins is with 5 nickels and 4 pennies. So the answer
> is the driver received no dimes. I'm pretty sure my answer is
> correct. But what I am assuming is that there are no other numerical
> possibilities between 29 and 841that would divide evenly into $8.41.
> There clearly are not 841 people on the bus, because that would mean
> they all paid a penny and would not meet the 9 coin requirement. I am
> assuming because it works with 29 people that there are no other
> combinations that satisfy both the # of people and # of coins.
>
> As for your question about on-line numeracy education, I am very
> interested in your findings, because I find community college remedial
> math classes to be a buzz with computer programs that seem to make
> certain aspects of management easier for the professors, but leave
> students to do math in further and further isolation.
>
> Mark
>
>
>
>
> *"Istas, Brooke" <IstasB at cowley.edu>*
> Sent by: numeracy-bounces at nifl.gov
>
> 08/05/2010 10:47 AM
> Please respond to
> The Math and Numeracy Discussion List <numeracy at nifl.gov>
>
>
>
> To
> <numeracy at nifl.gov>
> cc
>
> Subject
> [Numeracy 463] Puzzle/Thought of the Day
>
>
>
>
>
>
>
>
> Hello All!
>
> I have been working with my director on designing a research project
> that will show quantitatively that Adult Educators know how to teach
> and retain development math (numeracy) students who are not college
> ready better than an on-line program. While I love the on-line math
> program that is used by our mathematics department, I believe that
> low-level learners need to build self-confidence, deal with their
> emotions, and build connectivity. I am interested in what my
> colleagues think and feel about on-line numeracy education. Can it be
> done?
>
> Have a great day!
> Brooke Istas
>
> Thursday Puzzle:
> John and a group of his friends took a bus trip. Each person paid the
> bus driver with the same combination of 9 coins. If the bus driver
> received $8.41 from the group, how many dimes did he receive?
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