Q&A - P3 Math

[tianzhu]

Hi


I’ve a request via PM for a MD solution to this question.

Here’s my solution, hope this helps.

I’ve specially selected a golden background; hope 2011 will bring golden luck to all members of KSP.

Have a golden start to a happy, prosperous and healthy new year.

Best wishes

PS --- I've included more steps to show the flow of events.You may consolidate some of the steps as you become more familiar with MD.

http://farm6.static.flickr.com/5128/5310638207_4e1aa476da_b.jpg\">

[chokos]

Harry Had 289 more stamps than Dominic.

When Dominic gave away 161 of his stamps, he had half of what Harry had.
How many stamps did Dominic have at the beginning?

Pls help solving it using model.
Thanks!

[peterch]

I try to answer as follow

http://postimage.org/image/1anz63imc/

[plum-cake]

statement 1. Harry= domi+289

statement 2. Harry/2= domi-169

statement 1- statement 2 ie

(Harry - Harry/2 )= (domi-domi) + (289 - -169)
1/2 Harry = 458
Harry = 916

Statement 1 - 916 = domi + 289
therefore 916 - 289 = domi
627 = domi

I am not sure about the model

[CTong]

Do you have an answer for it? I have tried to work out and the answer is 611.

[plum-cake]

CTong:

Do you have an answer for it? I have tried to work out and the answer is 611.

how do you get that ans/ any working?

ok then I am not smarter than a p4 :!: tho I am a \"\" holder...

[peggy]

I’ve got 611 too!!

Dunno how to post picture here…

[aqeqiq]

This is from my p4 dd:


The answer is 611. It is not an internal transfer. :imanisland:

[Tang]

chokos:

Harry Had 289 more stamps than Dominic.

When Dominic gave away 161 of his stamps, he had half of what Harry had.
How many stamps did Dominic have at the beginning?

Pls help solving it using model.
Thanks!

Hi,


H [----------][----------]
D [----------][161]<289>

1 u --> 161 + 289 = 450

450 + 161 = 611

Dominic had 611 stamps at the beginning.

[plum-cake]

plum-cake:

statement 1. Harry= domi+289

statement 2. Harry/2= domi-169

statement 1- statement 2 ie

(Harry - Harry/2 )= (domi-domi) + (289 - -169)
1/2 Harry = 458
Harry = 916

Statement 1 - 916 = domi + 289
therefore 916 - 289 = domi
627 = domi

I am not sure about the model

no buddy noticed mine. I was checking what went wrong... this is it I put 169 for 161

statement 1. Harry= domi+289
statement 2. Harry/2= domi-161
statement 1- statement 2 ie

(Harry - Harry/2 )= (domi-domi) + (289 - -161)
1/2 Harry = 450
Harry = 900
Statement 1 - 900 = domi + 289
therefore 900- 289 = domi
611 = domi

:rahrah:
How to learn to draw the model .....and solve it..