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 By: Hweeps (offline)  Thursday, September 01 2011 @ 10:07 AM CDT (Read 1623 times)
Hweeps

This type of question appeared a few times in past years' papers. Can someone provide a solution via the model drawing method ?
A has \$349 in her wallet made up of only \$2 and \$5 notes. She has a total of 86 notes. How many \$5 are there in the wallet?
86 x 2 = 172
349 - 172 =. 177
5 - 2 =. 3
177 / 3. = 59
there are 59 \$5 notes.
Thanks.

Newbie

Registered: 08/29/11
Posts: 2

 By: saslwp (offline)  Tuesday, September 06 2011 @ 12:51 AM CDT
saslwp

Most sch or teachers will teach this using the guess and check method, meaning you build a table and
make a intelligent wild start to x number of \$2 and y number of \$5, and then narrow down to the correct
total amount and correct number of notes.
The answer you shown is normally taught to Olympaid students using the assumption method.
Explanation:
Assuming all the notes are of \$2, there will be 86 x 2 = \$172
349 - 172 = 177
All the \$5 have been counted as if they are \$2,
5 - 2 = 3
The difference in the value of \$5 and \$2 is \$3.
177 / 3 = 59
Hence there are 59 \$5 notes.

Hope this helps.

Newbie

Registered: 09/05/11
Posts: 2

 By: Hweeps (offline)  Tuesday, September 06 2011 @ 06:44 AM CDT
Hweeps

Thanks. I figure out the explanation to the answer but still don't know how to draw a model to get the answer. Was told by a school teacher that a model can be drawn to find the solution to this kind of question. Can you help??

Newbie

Registered: 08/29/11
Posts: 2

 By: ZombieFreak (offline)  Wednesday, September 07 2011 @ 03:32 AM CDT
ZombieFreak

Quote by: Hweeps

This type of question appeared a few times in past years' papers. Can someone provide a solution via the model drawing method ?
A has \$349 in her wallet made up of only \$2 and \$5 notes. She has a total of 86 notes. How many \$5 are there in the wallet?
86 x 2 = 172
349 - 172 =. 177
5 - 2 =. 3
177 / 3. = 59
there are 59 \$5 notes.
Thanks.

So easy also don't know.
Noob

Junior

Registered: 10/29/10
Posts: 17

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