Sign Up!
Login
Welcome to Test-paper.info
Friday, July 21 2017 @ 03:40 PM CDT
 Forum Index >  Test Paper Related >  Primary 5 Matters
 P5 Maths 2011 SA2 Nan Hua Paper 2 Q3
   |  Printable Version
By: geniuskids (offline)  Friday, October 19 2012 @ 07:00 AM CDT (Read 833 times)  
geniuskids

Can some kind soul pls explain the answer to me. Tks

Q3 : A group of children wanted to share the cost os a present for their teacher.
After one more child joined in, the cost was reduced by $1 to $10.
What was the original number of children?

Answer sheet is: 10รท1=10 There were 10 children at first.

Really don't understand the answer.
Help

Thanks

Forum Active Member
Active Member

Registered: 11/12/11
Posts: 169

Profile Email    
   
By: echeewh (offline)  Sunday, October 21 2012 @ 04:04 AM CDT  
echeewh

Hi there,

Following pls find my explanation and worked solution.

Let initial/original number of children be (1u).

<before>

<-1u->
|-------| --> (1u)

<after 1 child joined>

<-1u->
|-------|<1>| --> (1u + 1)


Cost per child (before) = $11
Cost per child (after) = $10

Since cost of present remains unchanged, we have ..

1u x 11 = (1u + 1) x 10
11u --> 10u + 10
11u - 10u --> 10
1u --> 10

Original number of children = 1u --> 10

==============

Trust this helps.

Do let me know again if there's further clarification.

Cheers,
Edward

Forum Active Member
Active Member

Registered: 04/21/11
Posts: 623

Profile Email    
   
By: geniuskids (offline)  Sunday, October 21 2012 @ 04:14 AM CDT  
geniuskids

Thanks Edward. I understand now.

Forum Active Member
Active Member

Registered: 11/12/11
Posts: 169

Profile Email    
   


 All times are CDT. The time is now 03:40 pm.
Normal Topic Normal Topic
Locked Topic Locked Topic
Sticky Topic Sticky Topic
New Post New Post
Sticky Topic w/ New Post Sticky Topic w/ New Post
Locked Topic w/ New Post Locked Topic w/ New Post
View Anonymous Posts 
Able to Post 
HTML Allowed 
Censored Content