# Maths question

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Originally Posted by Dinky Doo
What grade is your son in??
Year 7 in a selective school.

2. Originally Posted by Leisylou
Wow - that's awesome! SO impressed - that is pretty freaking amazing problem solving and if I knew how to do maths I'm sure it would make sense to me!!! Brilliant brain you have :-)
Thanks, but it's not that impressive - I just happen to have algebra as a learned skill. I was more impressed that you didn't but came up with your own way to solve it, that's what real intelligence is about!

Originally Posted by CMF
Ok. I've been staring at this for the last 10 mins, and I'm a bit stumped lol. So I get the initial equations, and I get why you minused the 1/2b etc to the other side, but where did the a=400-4c come from? Why did you do that rather than just minus it like you did the first 2 equations?
Annotated version? c+a/4=100 rearranges to a=400-4c.
2015-02-27 12.01.48.jpg

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Summer  (27-02-2015)

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Originally Posted by deku
Thanks, but it's not that impressive - I just happen to have algebra as a learned skill. I was more impressed that you didn't but came up with your own way to solve it, that's what real intelligence is about!

Annotated version? c+a/4=100 rearranges to a=400-4c.
Attachment 67765
Oh My God I did it!!! Took all of my brain power lol, but I followed alongside your instructions and I did it! Woohoo! Thank you SO much!

5. ## The Following User Says Thank You to CMF For This Useful Post:

deku  (27-02-2015)

6. Thank goodness this was solved. It would have haunted me forever.

7. Oooh I might see if I can find this mathematical riddle that I came across yesterday and it had me stumped, and start a spin off! I love algebra and I was devastated that I couldn't figure it out haha.

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so did you son confirm you had the right answer ?

Cos that just went WAAAAY over my head LOL.

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Originally Posted by 4LeafClover
so did you son confirm you had the right answer ?

Cos that just went WAAAAY over my head LOL.
Yes it's correct!

I told him as soon as he walked in the door. He wanted to know how long it took me lol. I did come clean though about PP figuring it out!

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wow ! good on your son and yourself

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