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 Post subject: Help with this Age questionPosted: Sat Jul 18, 2015 12:03 pm

Joined: Sun Mar 15, 2015 12:42 pm
Posts: 7
Hi All

I need help in solving this question ,

(1) Phillipa adds her age to her sister sonia's age .Between them they are half the age of their uncle Roy. Phillipa is 4 years older than sonia.Uncle Roy is 32 .How old is phillipa?

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 Post subject: Re: Help with this Age questionPosted: Sat Jul 18, 2015 12:10 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14006
Quote:
Phillipa adds her age to her sister sonia's age .
Between them they are half the age of their uncle Roy.
Phillipa is 4 years older than sonia.
Uncle Roy is 32 .
How old is phillipa?

Unpick the information

Uncle Roy is 32
Between them they are half the age of Uncle Roy .... so their ages add to?

Does that help?

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 Post subject: Re: Help with this Age questionPosted: Sat Jul 18, 2015 12:25 pm

Joined: Sun Mar 15, 2015 12:42 pm
Posts: 7
Thank You for the reply .

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 Post subject: Re: Help with this Age questionPosted: Sat Jul 18, 2015 12:54 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14006
OK - their ages add to 16 - yes?

If they were the same age they'd each be 8 but we want ages 4 year apart - so add 2 to 8 for the elder and take 2 for the younger (2 is half the difference we want) - this approach always works when you want a specific difference between two numbers.

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 Post subject: Re: Help with this Age questionPosted: Sat Jul 18, 2015 2:49 pm

Joined: Wed Jan 18, 2012 11:41 am
Posts: 6861
Location: Essex
Do primary pupils still do 'number bonds'? 'What two numbers add up to 16?' is just, 'find number bonds to 16', which may or may not be harder than the 'number bonds to 20' that ours did somewhere in the infants (I'm not a teacher and as a classroom helper I was always being told 'we don't do that' when I suggested something to bored kids who finished a task early ). Then just choose the pair that has a difference of 4.

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