Help
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Bananaperson
- Posts: 14
- Joined: Sun Apr 08, 2018 2:10 pm
Help
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/dow ... 5&type=pdf
Banana person
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/dow ... 5&type=pdf
Banana person
Last edited by Bananaperson on Mon Apr 09, 2018 5:32 pm, edited 1 time in total.
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anotherdad
- Posts: 1763
- Joined: Mon Jan 24, 2011 5:33 pm
Re: Help
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)
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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Decisiontime639
- Posts: 50
- Joined: Fri Jul 14, 2017 11:41 am
- Location: London
Re: Help
Id use substitution knowing what a square equals, etc.
