Hard A* GCSE Question Challenge - Perfect for Edexcel Calculator Paper Revision

Original post by gurpartapl

Hi guys,
created these questions myself and are very challenging. These types of questions are usually found at the end of the paper and require logical thinking and problem solving skills. The document i've attached contains 3 questions, ordered from easiest to hardest. Give them a go and tell me how you found those questions. If you become stuck simply notify me, and i can help you out. ~ Enjoy

PS - THE SOLUTIONS WILL BE ADDED BY TOMORROW AS I AM CURRENTLY REVISING ADD MATHS.

Thanks for this :smile:

Reply 2

penelopecrux

15

damn son

Reply 3

Wolfram Alpha

20

Thank you

.

Reply 4

ArMy07

Thanks! I'm also doing Add Maths - are you doing FSMQ?

Reply 5

k2sigma

OP

Original post by ArMy07

Thanks! I'm also doing Add Maths - are you doing FSMQ?

Yep! Good luck for your exam.

Reply 6

ArMy07

Original post by gurpartapl

Yep! Good luck for your exam.

Thanks you - good luck to you too.. Linear Programming will literally be the death of me...

Reply 7

Array00

Original post by gurpartapl

Hi guys,
created these questions myself and are very challenging. These types of questions are usually found at the end of the paper and require logical thinking and problem solving skills. The document i've attached contains 3 questions, ordered from easiest to hardest. Give them a go and tell me how you found those questions. If you become stuck simply notify me, and i can help you out. ~ Enjoy

All these questions are not drawn to scale

I have UPDATED the document with some changes to the final question as i noticed that some people might be prone to rounding errors... ( On the last question make sure you round your calculations in your working out to 3 sf, so that your final answer is unaffected)

PS - THE SOLUTIONS WILL BE ADDED BY TOMORROW AS I AM CURRENTLY REVISING ADD MATHS.

Hey, do you have the mark scheme for these questions? If so, is there any way you could send them to me please? Thanks

Reply 8

BTAnonymous

22

Good questions! Thanks!

Reply 9

mariyahx

6

hi gurp guess who this is

Reply 10

nadiakms

14

q2 I am unable to do, anyone available to explain?

Reply 11

username1986099

https://www.dropbox.com/s/8688d1zc2257reb/IMG_20160606_0001.pdf?dl=0

Original post by nadiakms

q2 I am unable to do, anyone available to explain?

After quite a bit of help, I finally arrived at the correct answer.
Step 1: Draw a probability tree - using the X
Step 2: Work out the probability of BB
Step 3: Form an equation equalling 6/30
Step 4: Simplify down to one equation (a quadratic)
Step 5: Solve using quadratic formula
Step 6: Pick the correct value.
Step 7: 20-your value is how many sweets he has.

Sorry, it's a bit rushed my explanation, here is a link to my working out :smile:

Reply 12

atomc19

11

Original post by danielwinstanley

After quite a bit of help, I finally arrived at the correct answer.
Step 1: Draw a probability tree - using the X
Step 2: Work out the probability of BB
Step 3: Form an equation equalling 6/30
Step 4: Simplify down to one equation (a quadratic)
Step 5: Solve using quadratic formula
Step 6: Pick the correct value.
Step 7: 20-your value is how many sweets he has.

Sorry, it's a bit rushed my explanation, here is a link to my working out :smile:

https://www.dropbox.com/s/8688d1zc2257reb/IMG_20160606_0001.pdf?dl=0

It doesn't really make sense. I got exactly the same value 9.2 (with almost identical working) but surely you'd end up with an integer if that was the correct number?

Reply 13

FatimaKhan2102

5

wow Thanks!! btw, how did you find the Add Maths? We had to self-teach ourselves and not sure if I've done well.

Reply 14

username1986099

Original post by thomas-cowley

It doesn't really make sense. I got exactly the same value 9.2 (with almost identical working) but surely you'd end up with an integer if that was the correct number?

Yes, I got 9.232124598 for a number of blue sweets. But I rounded to one significant figure. In the same way, you could have minused this decimal from 20 and got 10.7678754 which hence rounds to 11.

Sorry, if this isn't what you mean.

EDIT: I don't know if the answer is correct, but the person who created the thread said I got it right at 9 blue sweets.

(edited 8 years ago)

Reply 15

username2437011

Original post by thomas-cowley

It doesn't really make sense. I got exactly the same value 9.2 (with almost identical working) but surely you'd end up with an integer if that was the correct number?

I was confused about the same thing, got the same answer, but I realised it won't be correct, so I played around a little and I did x/20 *2, as it doesn't mention that he takes the 2 out separately, that gave me 2x/20 and then I equated it to 6/30 and rearranged and ended up getting 2 blue sweets, therefore 18 yellow sweets, however I think I may be wrong.

Reply 16

username2437011

Original post by danielwinstanley

Yes, I got 9.232124598 for a number of blue sweets. But I rounded to one significant figure. In the same way, you could have minused this decimal from 20 and got 10.7678754 which hence rounds to 11.

Sorry, if this isn't what you mean.

EDIT: I don't know if the answer is correct, but the person who created the thread said I got it right at 9 blue sweets.

But if he has 20 sweets then he should get an integer for the amount of blue sweets because having 9.2 blue sweets means you have 10.8 yellow sweets, and in regards to rounding, I'm sure you shouldn't have to round any number as the number of blue sweets in his pockets can only be a whole number. Confusing :s-smilie:

Edit: just saw you edited your post, sorry.

(edited 8 years ago)

Reply 17

username1986099

Original post by hamza772000

But if he has 20 sweets then he should get an integer for the amount of blue sweets because having 9.2 blue sweets means you have 10.8 yellow sweets, and in regards to rounding, I'm sure you shouldn't have to round any number as the number of blue sweets in his pockets can only be a whole number. Confusing :s-smilie:

Edit: just saw you edited your post, sorry.

I do see what you mean, @gurpartapl can you shine any light on this?

Reply 18

username2437011

Original post by danielwinstanley

I do see what you mean, @gurpartapl can you shine any light on this?

This is a lot like the Hannah's sweets question, apart from the fact that in that question you got an integer after solving, which made perfect sense.

Reply 19

k2sigma

OP