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 Post subject: Help
PostPosted: Mon Apr 09, 2018 12:25 pm 
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Joined: Sun Apr 08, 2018 1:10 pm
Posts: 6
Hi,

My child is practicing as many maths papers as possible. This question came up in a paper for the city girls school. I’m finding it challenging(im not a maths person) any help would be greatly appreciated
:) what method should be used? Trial and error? Or algebra?
Paper below!
Question 48(last one)
https://www.clsg.org.uk/attachments/download.asp?file=315&type=pdf

Banana person


Last edited by Bananaperson on Mon Apr 09, 2018 4:32 pm, edited 1 time in total.

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 Post subject: Re: Help
PostPosted: Mon Apr 09, 2018 2:44 pm 
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Joined: Mon Jan 24, 2011 4:33 pm
Posts: 951
This is the way I tackled it:

Since circle+triangle=square, you can substitute a square in place of (circle+triangle) in line 3 to give circle+square=hexagon.

From line 2, you can then deduce that circle=square because we now have circle+square=hexagon in line 3 as well as square+square=hexagon in line 2. In other words, adding a circle to a square has the same effect (resulting in a hexagon) as adding a square to a square.

From line 1, now we know that circle=square, that must mean that triangle=0 because adding triangle to a circle doesn't change its value.

(which means that circle=1, square=1 and hexagon=2)


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 Post subject: Re: Help
PostPosted: Mon Apr 09, 2018 4:25 pm 
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Joined: Sun Apr 08, 2018 1:10 pm
Posts: 6
Ahh i see..
Thanks :)


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 Post subject: Re: Help
PostPosted: Sat Apr 14, 2018 11:37 am 
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Joined: Fri Jul 14, 2017 10:41 am
Posts: 28
Location: London
Id use substitution knowing what a square equals, etc.


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 Post subject: Re: Help
PostPosted: Sat Apr 21, 2018 3:52 pm 
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Joined: Sat Oct 17, 2015 9:46 am
Posts: 37
Hello all

I tried to get my daughter to complete the paper above. Does anyone know where I can get the answers?

I would really appreciate it.


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 Post subject: Re: Help
PostPosted: Sat Apr 21, 2018 8:04 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14695
Post any questions you are unsure of and I'll check them.


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 Post subject: Re: Help
PostPosted: Mon Apr 23, 2018 8:41 pm 
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Joined: Sat Oct 17, 2015 9:46 am
Posts: 37
Thank you Guest55 I will have a look and get to you.


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