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PostPosted: Wed Mar 30, 2011 8:44 pm 
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Joined: Wed Jun 16, 2010 12:17 pm
Posts: 14
Hi All,

Please help. Here's the question:

The ages of Henry, James & Toby add up to 104. Henry is twice as old as James and James and Toby are twins. How old is Henry?

I worked out the answer to be 52. Can anyone share how best to arrive at the answer in a logical, step by step method that a 10 year old can understand.

Thanks


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PostPosted: Wed Mar 30, 2011 9:12 pm 
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Joined: Sat Feb 13, 2010 11:02 pm
Posts: 420
kaytee1916 wrote:
The ages of Henry, James & Toby add up to 104. Henry is twice as old as James and James and Toby are twins. How old is Henry?

As Henry is twice as old as James, he can replace both of the twins in the original formula

Henry+James +Toby =104

can become

Henry +Henry = 104

therefore Henry =52


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PostPosted: Thu Mar 31, 2011 10:09 am 
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Very well explained! Thanks very much, 999mum.


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PostPosted: Thu Mar 31, 2011 11:24 am 
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Joined: Sun May 09, 2010 12:04 pm
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Please, could anyone advise a book with this kind of exercises: word problems involving algebra?
Thanks in advance! :D


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PostPosted: Fri Apr 01, 2011 9:40 am 
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sorry I can't but if this is the type of question that comes up frequently in the exams you are aiming at, it might be a good idea to construct some problems of your own?


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