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PostPosted: Sat Aug 07, 2010 2:21 pm 
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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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PostPosted: Sat Aug 07, 2010 2:35 pm 
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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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PostPosted: Sat Aug 07, 2010 2:41 pm 
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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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PostPosted: Sat Aug 07, 2010 2:59 pm 
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many thanks Bewildered I could see it now

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PostPosted: Sat Aug 07, 2010 3:01 pm 
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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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PostPosted: Sat Aug 07, 2010 3:20 pm 
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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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PostPosted: Sat Aug 07, 2010 3:23 pm 
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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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PostPosted: 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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PostPosted: Sat Aug 07, 2010 5:13 pm 
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Didn't the book have the answer somewhere?


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PostPosted: Sat Aug 07, 2010 5:24 pm 
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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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