Answer this and then I'll tell you why I've asked it.

41 to 49 of 49 messages
kittenkat    pirate
28/01/2013 at 19:30

SEE how I got thrown out of maths?

28/01/2013 at 19:58
Grast_girl: more basic algebra

If sales before commission are y, then sales after commission are y-18
Commission is calculated as being 10% of y-18, ie (y-18) x 0.1, which course is 18, the value of the commission

Thus (y-18) x 0.1 = 18
or y-18 = 180
hence y=180+18 = 198

Check for those who doubt:
sales after commission are 198 -18 = 180
Commission is 10% of 180 = 18
29/01/2013 at 08:13

I got thrown out of O level maths too KK - right at the last minute when it became obvious o the teacher I was going to fail (it had been obvious to me all along). I had to swap to the CSE class and catch up on the syllabus.

Got an "A" in A level English Lit though 

01/02/2013 at 14:32
literatin wrote (see)

I got it right but didn't bother to dredge up my algebra skills (which I'm fairly sure I didn't have when I was 8!). Try this instead:

Pile 1 has 4 more coins than pile 2, so it has to have at least 4 coins in it. That would make it 4+0+1... oops, can't have 2x0, so that's not the answer and doesn't use all the coins anyway.

Try again with 5 coins in pile 1. 5+1+2+2 works okay except they don't add up to 20.

(By this point she'll probably be happy enough to skip stage 3..., but obvs it's 6+2+3+4=15)

Then try it with 7 coins in pile 1 and it works AND adds up to 20, so you can stop.

2x0=0. You can multiply by zero, but if you try to multiply by zero the world as we know it can fall apart!

01/02/2013 at 15:47

well, okay, yes you can, but not if you want all your piles to have coins in. Otherwise she hasn't made four piles of coins. I should have started with at least one in pile 2 really.

kittenkat    pirate
01/02/2013 at 16:14

Sorry to disappoint guys, kitten has been off school poorly for the last 2 days, and so missed the homework handed out yesterday.

01/02/2013 at 17:21

Hope she's better soon, KK, and not just so we can all do her homework...

kittenkat    pirate
01/02/2013 at 17:38

Thanks

01/02/2013 at 23:23
Herer's some more algebra for you

To over come the short comings of posting you need to know that a2 means "a squared" etc. So...

a=b
Therefore a2=ab
and a2-b2=ab-b2
factoring gives (a-b)(a+b)=b(a-b)
dividing through by (a-b) gives a+b=b
as a=b, then b+b=b
or 2b=b
ie 2=1

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