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Edexcel D1 - 17th June, 2016 [Exam discussion]

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but if it was the optimal point at 10.8 or whatever it would have to be lower as that is the maximum just wondering

It went up on a scale of 2 per box or something. So 11 was 2.5 of the tiny boxes along the x axis, which still fit within the constraints by simple observation

Reply 941

pecora

Original post by iMacJack

entire linear programming question was 14 marks

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Original post by Nikhilm

14 marks in total and thanks

***** ******** ********** ********

Reply 942

Ec0n

Original post by Student403

Do remember there were other constraints aside from the cost one :tongue:

I'm an idiot ahah, what was I thinking in the exam! Thanks :P

Hopefully I can still scrape above the 80 UMS boundary ;/

Reply 943

Harrydickens

Can anyone remember the 3 different lengths of the possible routes in the route inspection problem

Reply 944

boyyo

Original post by Student403

Do remember there were other constraints aside from the cost one :tongue:

one of them was x greater than or equal to 8

another was, -X +24y greater than equal to 24

cant remember the others.

Reply 945

iMacJack

Original post by Student403

Do remember there were other constraints aside from the cost one :tongue:

-x+24y>= 24
x>=24
7x+8y<= 112?

objective line
maximise x + 1.5y

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Reply 946

TheMathsMan

If anyone has an unofficial markscheme with the amount of marks for each part in each question ... if you could link it that would be very much appreciated.

Reply 947

Vannzzoo

What value did you guys get for t??

Reply 948

Craig1998

What were the values for w, x, y, z
I think w was 11, z was 4 and yx were the numbers in the adjacent boxes.

Reply 949

Nuggetsarelife

Im a million percent sure
Prim= 80
Optimal Vertex = 11,4
Total Cost = £480

Reply 950

Student403

Original post by _newbe

simple observation alright don't need to keep underlining your right really you don't know you are just guessing I did the question in 5 minutes so didn't have time to count squares in the graph just went off the principles of linear programming I've spoke to a lot of people you put 10 so it's up in the air

Oh I'm guessing? ... If you say so.

Constraints are below. Feel free to try them both out and let me know if 11, 4 fits :tongue:

Original post by iMacJack

-x+24y>= 24
x >=2
7x+8y<= 112?
20x + 65y <= 520

objective line
maximise x + 1.5y

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Oh I wasn't asking but cool that you remembered :tongue:

it was x>= 2 btw, IIRC
Just inserted the other one for sake of guy above

Reply 951

lotterydiscovery

What was the lower bound number of workers for the gantt chart question??

Reply 952

brokeins1

Original post by Harrydickens

Can anyone remember the 3 different lengths of the possible routes in the route inspection problem

75 was the shortest( not sure thou)

Reply 953

justalawyer1998

What were all th questions in linear programming q?

Reply 954

lotterydiscovery

Original post by Nuggetsarelife

Im a million percent sure
Prim= 80
Optimal Vertex = 11,4
Total Cost = £480

Any chance you can remember any of the arcs you listed or weights that added up to 80? Long shot i know :/

Reply 955

Nuggetsarelife

[QUOTE="lotterydiscovery;65877804"]Any chance you can remember any of the arcs you listed or weights that added up to 80? Long shot i know :/[/QUOTE

NO WAY!😂

Reply 956

_newbe

Original post by Student403

Oh I'm guessing? ... If you say so.

Constraints are below. Feel free to try them both out and let me know if 11, 4 fits :tongue:

Oh I wasn't asking but cool that you remembered :tongue:

it was x>= 2 btw, IIRC
Just inserted the other one for sake of guy above

I'm guessing aswel cos I don't know the markscheme your going on like you wrote the paper nothing worse than when people go on like cocky idiots on the student room to put others down about an exam I was simply only asking regardless it is like a mark on the paper