
By: geniuskids (offline) Friday, October 19 2012 @ 07:00 AM CDT (Read 875 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

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Registered: 11/12/11 Posts: 169





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

Active Member
Registered: 04/21/11 Posts: 627





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



geniuskids 
Thanks Edward. I understand now.

Active Member
Registered: 11/12/11 Posts: 169



