Welcome to Test-paper.info
Sunday, February 25 2018 @ 11:32 AM CST
 Select a Forum » General Chat » Primary 1 Matters » Primary 2 Matters » Primary 3 Matters » Primary 4 Matters » Primary 5 Matters » Primary 6 Matters » Question, Feedback and Comments » Education Classified
 Forum Index >  Test Paper Related >  Primary 6 Matters Can't make sense of this question.
 | Printable Version
 By: drstevewu (offline)  Friday, July 26 2013 @ 10:58 AM CDT (Read 1251 times)
drstevewu

Hi, I can't make sense of the following question. Need your help.

Question: Harry, Larry and Sean were to share a box of marbles. Harry took 1/5 more than his rightful share of marbles. Larry took 1/3 of the remaining marbles. Sean took his rightful share of marbles. After that, there were 40 marbles left. How many marbles were there in the box at first?

Cheers...

Junior

Registered: 04/20/10
Posts: 31

 By: echeewh (offline)  Friday, July 26 2013 @ 05:17 PM CDT
echeewh

Hi <drstevewu>,

My thoughts are that the question may not have been clear enough. I think perhaps one can take it that the box of marbles was shared equally among the 3 boys. Then I believe you can work out the answer easily. And btw, is there any marks given for this question? Or is there an <Answerkey>?. Thank you.

Cheers,
Edward

Active Member

Registered: 04/21/11
Posts: 627

 By: drstevewu (offline)  Saturday, July 27 2013 @ 04:06 AM CDT
drstevewu

Hi Edward,

Thanks for your reply. I have the answer key but honestly I don't quite agree with it. The answer key is as follow:

"Let there be 30 units of marbles at first, and each boy was to take 10 units.
Harry took 10 + 2 = 12 units, and there were 30 - 12 = 18 units left.
Larry took 1/3 x 18 units = 6 units, and there were 18 - 6 = 12 units left.
Sean took his rightful share of 10 units, and there were 12 - 10 = 2 units left.
2 units = 40 marbles
1 unit = 40/2 = 20 marbles.
At first, there were 30 units, = 30 x 20 = 600 marbles"

I don't agree in that part where it assume there were 30 units at first. I mean how can a student be able to assume there were "30 units" in the first place?

Thank you again for your help.

Cheers,
Steve Wu

Junior

Registered: 04/20/10
Posts: 31

 By: echeewh (offline)  Saturday, July 27 2013 @ 07:19 PM CDT
echeewh

Hi Steve,

Yes you have my vote on that too ( with regards to the assumption used / stated in the Answerkey ).

But I believe you do have a more appropriate solution for your child that gives the same result as 600.

Cheers and best regards,
Edward

Active Member

Registered: 04/21/11
Posts: 627

 All times are CST. The time is now 11:32 am.
 Normal Topic Locked Topic Sticky Topic
 New Post Sticky Topic w/ New Post Locked Topic w/ New Post
 View Anonymous Posts Able to Post HTML Allowed Censored Content