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 Post subject: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 2:21 pm

Joined: Mon Jul 19, 2010 12:30 pm
Posts: 126
help please with this question,it is driving me mad as neither I nor my daughter could solve it.

2 ( 9 ) 5 , 4 (21) 5 , 5 ( ? ) 2

Many thanks

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stressedparent

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 2:35 pm

Joined: Mon Feb 20, 2006 1:29 pm
Posts: 1806
Location: Berkshire
stressedparent wrote:
help please with this question,it is driving me mad as neither I nor my daughter could solve it.

2 ( 9 ) 5 , 4 (21) 5 , 5 ( ? ) 2

Many thanks

Only thing that makes sense is...

2 ( 9 ) 5 ........... 2x2=4 then add the 5 =9
4 (21) 5 ........... 4x4=16 then add the 5 =21
5 ( ? ) 2 ........... 5x5=25 then add the 2= 27

therefore answer... 5 ( 27 ) 2

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 2:41 pm

Joined: Mon Dec 21, 2009 9:47 am
Posts: 18
Location: Kent
hello I think it is

2 (9) 5 = 2x5-1

4 (21) 5 = 4 x 5 -1

therefore

5 ( 9) 2 = 5x2-1

Hope this is right all i can think of
Applepie

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 2:59 pm

Joined: Mon Jul 19, 2010 12:30 pm
Posts: 126
many thanks Bewildered I could see it now

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stressedparent

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 3:01 pm

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2668
I would go for applepies method, as you must use the numbers either side of the brackets first.

Which publisher is this from? What was their answer?

Patricia

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 3:20 pm

Joined: Wed Aug 13, 2008 4:25 pm
Posts: 2630
Applepies method doesn't work as you would have to add 1 to get 21 not - 1.

- would have used Bewildereds method so am suprised to hear that it is incorrect.

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 3:23 pm

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2668
Quite right too!

Going back to my siesta...

Will take another look later. Not saying Bewildered is incorrect.

Would be interested in the publisher and their answer.

Patricia

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 4:57 pm
I'd say bewildered's was correct as it does use the outside brackets first?

1. 2 squared +5 = 9
2. 4 squared + 5 = 21
3. 5 squared + 2 = 27

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 5:13 pm

Joined: Thu Sep 24, 2009 10:59 am
Posts: 6899
Didn't the book have the answer somewhere?

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 Post subject: Re: Answer to a type 19 question pleasePosted: Sat Aug 07, 2010 5:24 pm

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2668
I think Bewildereds method is probably the answer , however it does not use the known technique of using the numbers either side of the brackets in the first instance. [squaring one the numbers is "doing" something to one of the numbers before you start]

However...

Patricia

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