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Can someone do this GCSE maths question?

maths question.pngPlease can someone good at maths do this question? I keep getting 22,476 for the final answer.

On the mark scheme it says (pi)(4^2)(90) is 4527, but I get it as 4523? I'm not sure if the Pi on my calc or something is wrong, but I can't get this? thank you
(edited 8 years ago)
Original post by jazz_xox_
maths question.pngPlease can someone good at maths do this question? I keep getting 22,476 for the final answer.

On the mark scheme it says (pi)(4^2)(90) is 4527, but I get it as 4523? I'm not sure if the Pi on my calc or something is wrong, but I can't get this? thank you


Hmm very strange. I also got 22,476 as the answer and (pi)(4^2)(90) as 4523. Is this AQA? What exam season is this past paper from?
(edited 8 years ago)
No my calculator says the same :/
Mark scheme is wrong
(edited 8 years ago)
I also got 22,476. I think the mark scheme is wrong.
OMG MATHS <3

Anyways

Area of a Cuboid = Length x Width x Height
Area of the cuboid = 90cm x 15cm x 20cm = 27000cm3 (cubed)

Area of cylinder = (2 x π x r x h) + (2 x π x r x 2)
Area of cylinder = (2 x π x 4 x 90) + (2 x π x 4 x 2)
Area of cylinder = 2312.21cm2 (to 2 decimal places)

Area of remaining Concrete cuboid = Area of cuboid - Area of cylinder
therefore Area of remaining concrete cuboid = 24687.79

Please check it is right as I'm tired lol.
Reply 5
Avatar for jazz_xox_
jazz_xox_
OP
13
ah thank you everyone, i was sure i was right! @rosiehannay yes its AQA, June 2014 Paper 1 :smile:
Original post by jazz_xox_
maths question.pngPlease can someone good at maths do this question? I keep getting 22,476 for the final answer.

On the mark scheme it says (pi)(4^2)(90) is 4527, but I get it as 4523? I'm not sure if the Pi on my calc or something is wrong, but I can't get this? thank you


Yep I got the exact same thing. By the way, quick question, do they give you formaulas eg volume of a cylinder in the exam paper?
I just found the paper the question is from and had a look at the mark scheme. It doesn't say the volume of the cylinder is 4,527, it says the answer can be between 4,500 and 4,527 - obviously allowing people to use different numbers as pi. It says the final answer can be between 22,473 and 22,500 so yes, all our answers were correct :tongue:
Reply 8
Avatar for jazz_xox_
jazz_xox_
OP
13
Original post by Bulletzone
OMG MATHS <3

Anyways

Area of a Cuboid = Length x Width x Height
Area of the cuboid = 90cm x 15cm x 20cm = 27000cm3 (cubed)

Area of cylinder = (2 x π x r x h) + (2 x π x r x 2)
Area of cylinder = (2 x π x 4 x 90) + (2 x π x 4 x 2)
Area of cylinder = 2312.21cm2 (to 2 decimal places)

Area of remaining Concrete cuboid = Area of cuboid - Area of cylinder
therefore Area of remaining concrete cuboid = 24687.79

Please check it is right as I'm tired lol.


This isn't what I got, I did the cylinder inside as 16π x 90 and got 4523.89 and then took that from 27000 :smile:
Reply 9
Avatar for jazz_xox_
jazz_xox_
OP
13
Original post by rosiehannay
I just found the paper the question is from and had a look at the mark scheme. It doesn't say the volume of the cylinder is 4,527, it says the answer can be between 4,500 and 4,527 - obviously allowing people to use different numbers as pi. It says the final answer can be between 22,473 and 22,500 so yes, all our answers were correct :tongue:


ah thank you, my mistake :colondollar:
Original post by Bulletzone
OMG MATHS <3

Anyways

Area of a Cuboid = Length x Width x Height
Area of the cuboid = 90cm x 15cm x 20cm = 27000cm3 (cubed)

Area of cylinder = (2 x π x r x h) + (2 x π x r x 2)
Area of cylinder = (2 x π x 4 x 90) + (2 x π x 4 x 2)
Area of cylinder = 2312.21cm2 (to 2 decimal places)

Area of remaining Concrete cuboid = Area of cuboid - Area of cylinder
therefore Area of remaining concrete cuboid = 24687.79

Please check it is right as I'm tired lol.


What? Yeah buddy, you are tired :tongue: Why are you working out the area?.. Just go to sleep :sleep:
Original post by jazz_xox_
ah thank you, my mistake :colondollar:


No problemo :biggrin:
Original post by rosiehannay
What? Yeah buddy, you are tired :tongue: Why are you working out the area?.. Just go to sleep :sleep:


I can't, Left French homework for the last day :colonhash:
Original post by Bulletzone
I can't, Left French homework for the last day :colonhash:


Hope you're not too tired for that
How is that 5 marks? It's so easy?

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