AMC Thursday

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Who else is doing it?

Also how do you do well in it lol

[squance]

Since my sister is doing Specialist Maths and Maths Methods, her maths teacher is forcing her to do it (she doesn't want to do it)

[kurrymuncher]

yeah, Im doing it, but I dont want to miss double physics. nooooooo

[Damo17]

I'm doing it, but I'm also missing physics (a SAC) so I have to do it period 5/6 (my frees!!!).

[cobby]

Im doing it
Miss out on double english

[mandy]

I'm doing the Math comp toooo.

[kat148]

Practice for anyone interested!

http://www.amt.canberra.edu.au/wuamc.html

EDIT: added 2007 senior paper questions 26 - 30 (see attached)

Answers :not vetted..26) 41  27) 861  28) 10  29) 899  30) 83

[zzdfa]

i want to do it =(

[mandy]

i want to do it =(

Why aren't you doing it?

[naved_s9994]

Im doing it.

Since this is viewed by many people,
i am keen on asking everyone this.

Q. What stratergies are undertaken by people.
Ive been doing this each year since yr 7....got 1 credit in year 8, and all borderline distinctions for the rest,

Like, any stratergies especially for the last..5 marks questions etc etc

Much Appreciated!

[EvangelionZeta]

What I do is do the first 20 questions, then jump straight to the last five, look at them, work out which ones are the most "doable" and then do them.  Then I just ignore the hard looking ones and go to the ones in 21-25.  This way, you get the last section out of the way earlier (hence more marks), and you still have a chance of guessing/working out 21-25 (with a relatively good chance of getting at least one of them right).

Got a prize year 7-9, and a distinction last year, so it works. 

[naved_s9994]

Is the answer D (40000Km), or have I fallen into a trap.

[zzdfa]

its 48k. its the same tyres for all 4 wheels but tyres in front wear out faster.

i remember seeing this problem ages ago. the way i did it back then was to assign each tyre 1 'hitpoint'. each kilometre travelled would reduce the 'hit points' of the front tyre by 1/40k and the rear tyre by 1/60k.

obviously if you switch the front and back tyres after x kilometers travelled, you will get more than 40k.

so the question is to find the x at which you should switch your tyres, such that they will reach 0 hit points at the same time. which happens to be the harmonic mean of 40k and 60k, which you will see if you do all the algebra.

btw, is this a 11-20 problem or 21-30 problem?

i want to do it =(

Why aren't you doing it?

not in hs anymore

[naved_s9994]

its a 21-30 from memory.
...BUT

Q. If the wheels on the front go till 40000Km for eg.
Then, we'd have to change to the rear ones. I.e now they can go till 600000Km.

However, those wheels on the rear have also already run 40000Km, and when they are placed on the front
they cannot create a futher distance of travel?
So, they can is on halt? I.e D?

Help lol, any justified answers

[naved_s9994]

because the question says.... 40000Km on front   OR   60000Km or rear