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AQA Decision 1 - Friday 6th June

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That was the easiest maths exam I have done so far. Thought it was considerably easier than all the past papers as well, think there will be some good results in this module throughout the country...

Reply 41

Kelly^2

er y=34 rings a bell somewhere i think
because it was 33.33

Reply 42

xx_tory_xx

Hmm... not too sure on this one. I hink i got £138, with x=28 and y=30. But i did that from looking at my graph and not putting the equations equal to eachother....didnt think of that till the exam was over so not sure if its right!! lol

Reply 43

Kelly^2

Think I probably got £138 as the cost :smile:

it was 1.5X + something else :s-smilie:

the 9 and 3 one i was on about was the Dijkstras one lol sorry people

Reply 44

rainbow drops

i got the co-ordinate of the minimum point as (30,30) i think, and i think i got £105. eeek :frown:

Reply 45

xx_tory_xx

1.5*28+3*30 i thought, but that equals 132?? So confused now, just gonna have to wait for results.... so long though!!

Reply 46

Kelly^2

I definately got 34 as one of the co ordinates I think :s-smilie:

Reply 47

Kathrin

xx_tory_xx

1.5*28+3*30 i thought, but that equals 132?? So confused now, just gonna have to wait for results.... so long though!!

Yes - thats what I got, well nearly: 1.5x27 + 3x30

What explanations did everyone give for Q. 4?

Reply 48

TheBigMooseMan

I got (32,32) as the co ordinates. The cost was C = 1.5x + 3y. That gives C to be £144.

Reply 49

rainbow drops

argh mine looks so wrong now :s-smilie:

i was completely definite on it during the exam, and it looked right and everything... uh oh. that's like 3 marks gone :frown:

like you said, we'll just have to wait for the results.

my exams are over now so i'm not actually bothered :biggrin:

i'm too happy!

Reply 50

TheBigMooseMan

Upper bound - Because it can be improved.

Lower bound - Because it can't be improved.

I don't know if that was the question, but that is what I put for that question.

Reply 51

rainbow drops

ahh i remember completely now, i got £135 as the cost. i got confused then and thought it was 0.5x, but it was 1.5x.

Reply 52

Kelly^2

**** im scared now.
I got 34 for the y co ordinate definately.

Reply 53

3thr3e

TheBigMooseMan

I got (32,32) as the co ordinates. The cost was C = 1.5x + 3y. That gives C to be £144.

same

Reply 54

The Muon

I got £141 with 26 and 34 - dont forget that one of the constratins regarding total number made was

x+y \geq 60

so your co ordinates had to add up to more than or atleast 60

Reply 55

-WhySoSerious?

Kelly^2

er y=34 rings a bell somewhere i think
because it was 33.33

THANK GOD.

I thought I was wrong, but maybe not! :biggrin:

Okay, maybe I was :frown:

Reply 56

Lu-x

The minimum cost was found where the lines y + x = 60 and x + 4y = 160 intersected. It was difficult to decide which point gave the lowest value: there were two very close ones, but it was definitely this point.

This gave x = 27 (rounded up from 26.666 so that it remained in the feasible region) and y = 34 (rounded up from 33.333). They had to be whole numbers since you can't get 26.666 locks!

Which gave £142.50 as the minimum cost, since 1.5(27) + 3(34) = 142.5

Reply 57

jonny_shaw

3thr3e

same

can't be y had to be greater than x, they cant be the same...

I got (28, 34)!!

My two lowest costs were (80/3 , 100/3) gave me £140 i think? and (32,32) for £144 (i checked the smallest two to be sure lol) But now looks like I got it wrong
I hate decision anyway, I'd rather do statistics than decision :frown:

(and I hate stats lol)