Competition - post a photo you've taken of nature >>

OCR (not MEI) D1 24th May 2013

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Reply 100

Bloxorus

Original post by benitashrestha

I got like 90 and 6 :\\

I got this too.

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Reply 101

ben494

What values of x and y did people get for the last question to equal 88 but manage to keep 3x+4y less than 30?

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Reply 102

Christd

Original post by breakeven

Did this one as a resit from January and I think it was a waste of £20. Didn't go well at all, hope you guys did good though!

£20 wasted on me too, at least we have the Jan mark to fall back on :P

Reply 103

Music99

That went absolutely awful! I think I got a U ;(.

Reply 104

JimmyA*

Original post by Bloxorus

I got this too.

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I would also say i got this too, but unfortunately i didn't haha. I don't have a clue how i got 90 and 5 :frown:

Reply 105

AlesanaWill

Original post by ben494

What values of x and y did people get for the last question to equal 88 but manage to keep 3x+4y less than 30?

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I'm pretty sure I didn't get 88. I think I got 56 or something like that for the optimal graphical solution? I made an error on Simplex.

Reply 106

purplemind

I got 56 for both graphical and Simplex at (4,4.5)
For an integer solution, I got 54 at (6,3).

Reply 107

DarkPeople

Original post by JimmyA*

I would also say i got this too, but unfortunately i didn't haha. I don't have a clue how i got 90 and 5 :frown:

Actually, now that I've read your post, I think I got 90 and 5 too? Because I remember calculating 30/6 to get 5?

Reply 108

ben494

Original post by AlesanaWill

I'm pretty sure I didn't get 88. I think I got 56 or something like that for the optimal graphical solution? I made an error on Simplex.

Yeah i got 56 as well but everyone else on here seemed to be getting 88. Glad somebody else got 56!

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Reply 109

kabutsu12

I think the 88 one was x=6 and y=8, could have been the other way round though. I'm fairly certain this is correct.

Reply 110

benitashrestha

Original post by AlesanaWill

I'm pretty sure I didn't get 88. I think I got 56 or something like that for the optimal graphical solution? I made an error on Simplex.

yes the values were like 56, 9, 32, 4.5 (down the output column)
I did in my graphical calculator so I still have the answers :smile:

Reply 111

sj_1995

Original post by AlesanaWill

I'm pretty sure I didn't get 88. I think I got 56 or something like that for the optimal graphical solution? I made an error on Simplex.

I got 56 too. (Messed up the LP though so couldn't verify it with my graph) I cant see it being 88 since if you solve the simultaneous equation 88=5x+3y and one of the other constraints, 3x+4y=30, you get a negative value for y, which doesn't comply with x,y,z >/= 0

Reply 112

purplemind

Original post by kabutsu12

I think the 88 one was x=6 and y=8, could have been the other way round though. I'm fairly certain this is correct.

How?
It was outside the feasible region.

Reply 113

kabutsu12

can anyone remember the constraint equations and the optimisation formula?

Reply 114

ben494

Original post by kabutsu12

can anyone remember the constraint equations and the optimisation formula?

P=5x+8y
-8y+3x}-24
3x+4y{30
3x-2y{12

I think

} = greater than or equal to
{ = less than or equal to

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Reply 115

sj_1995

Original post by kabutsu12

can anyone remember the constraint equations and the optimisation formula?

I think it was Maximise P = 5x + 3y
Subject to;

3x-2y <12
3y+4y <30
3x-8y>-24
x,y,z>0

(all should be or equal to as well)

Reply 116

swagisforboys

I got 56 as well at 4, 4.5
and the integer one at 6,3

i got 5 and 90 for the f and m values.
I didn't think it went that bad but everyone else thought it was horrible