# GCSE Students, post your math problems (Revision for Edexcel Maths on 28th...)

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#1
Yeah...this is my half term sorted.

I'm no whiz at maths....I'm average-stroke-meh, but I'm trying to do as well as possible in an upcoming exam on the 28th and therefore anyone needing help with anything in general that's on the Edexcel GCSE syllabus(Preferably NON-CALC), comment and I'll try and answer with a elaborate comment with a method If I've learnt the topic.

The aim is to improve and work on weaknesses in particular topics.

Also, anyone with any revision tips, PLEASE post them.

Feel free to join if you know the answers to any comments!

Many Thanks.
0
7 years ago
#2
(Original post by MisterOrange)
Yeah...this is my half term sorted.

I'm no whiz at maths....I'm average-stroke-meh, but I'm trying to do as well as possible in an upcoming exam on the 28th and therefore anyone needing help with anything in general that's on the Edexcel GCSE syllabus(Preferably NON-CALC), comment and I'll try and answer with a elaborate comment with a method If I've learnt the topic.

The aim is to improve and work on weaknesses in particular topics.

Also, anyone with any revision tips, PLEASE post them.

Feel free to join if you know the answers to any comments!

Many Thanks.
Lucky You!! ive just finished my half term and back at school... :/ - the agonising last 2 weeks before the exam is killing me already!!!! Ive managed to go from a D candidate to a hopeful A grade candidate!!! - teachers ey..
1
7 years ago
#3
Hey, I'm really stuck on this question from a past paper. Can someone help?

'The diagram shows two similar solids, A and B.
*Picture of 3D pentagonal prism with 5cm sides, next to a larger 3D pentagonal prism with 8cm sides*

Solid A has a volume of 80cm.
a) Work out the volume of solid B.

Solid B has a total surface area of 160cm-squared.
b) Work out the total surface area of solid A.'

I know it's probably quite basic but I'm so stuck.
1
#4
(Original post by TaraAndZara)
Hey, I'm really stuck on this question from a past paper. Can someone help?

'The diagram shows two similar solids, A and B.
*Picture of 3D pentagonal prism with 5cm sides, next to a larger 3D pentagonal prism with 8cm sides*

Solid A has a volume of 80cm.
a) Work out the volume of solid B.

Solid B has a total surface area of 160cm-squared.
b) Work out the total surface area of solid A.'

I know it's probably quite basic but I'm so stuck.

80cm for the volume of Solid A, which has a side of 4? I've found the past paper and it says 4cm, not 5cm? I'll assume you meant 4cm

Anyways, i'm assuming you multiply the given side from B by Solid A's volume to give you the volume of Solid B.

THEREFORE, 8X80 = 640cm3(Volume of B)

For b)

I think you divide by the given side and volume, so they've given Solid B to have a Surface Area of 160 - Divide this by the given side of Solid A which is 4.

160/4 = 40cm2.

The mark scheme is here, incase you needed it, thanks for the post too - I guess i need to brush up on stuff similar to this too.

http://www.thestudentroom.co.uk/show....php?t=2169186
1
7 years ago
#5
Hi,
While practising some questions in CGP workbook on simultaneous equations, I found this question:

Solve 3(x-y)/5 = x-3y = x-6

Regards
Omar
0
7 years ago
#6
(Original post by omarzizo)
Hi,
While practising some questions in CGP workbook on simultaneous equations, I found this question:

Solve 3(x-y)/5 = x-3y = x-6

Regards
Omar
Are you sure the question had two equals signs?

Because all of that simplifies to:

0
7 years ago
#7
Yeh it did have 2 equal signs. The answers were x = 12 and y = 2 but still dont understand it?
0
7 years ago
#8
(Original post by 0x2a)
Are you sure the question had two equals signs?

Because all of that simplifies to:

but where did you get the -25 from
0
7 years ago
#9
(Original post by omarzizo)
but where did you get the -25 from
I messed up the equation

Should be -30
0
7 years ago
#10
I'd suggest using http://www.examsolutions.net/ for revision, it's got a lot of relevant video tutorials on there
1
6 months ago
#11
(Original post by MisterOrange)
80cm for the volume of Solid A, which has a side of 4? I've found the past paper and it says 4cm, not 5cm? I'll assume you meant 4cm

Anyways, i'm assuming you multiply the given side from B by Solid A's volume to give you the volume of Solid B.

THEREFORE, 8X80 = 640cm3(Volume of B)

For b)

I think you divide by the given side and volume, so they've given Solid B to have a Surface Area of 160 - Divide this by the given side of Solid A which is 4.

160/4 = 40cm2.

The mark scheme is here, incase you needed it, thanks for the post too - I guess i need to brush up on stuff similar to this too.

http://www.thestudentroom.co.uk/show....php?t=2169186
Why do you divide instead of times in Qb
0
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