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# Zoes GCSE maths help watch

1. (Original post by RDKGames)
Work out the area of the cross section first before multiplying it by 20 which is the depth of the prism.

Any help on understanding this question please

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2. (Original post by z_o_e)
Any help on understanding this question please

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25 litres is made up from orange juice, lemonade, and cranberry juice.

To work out the amount of orange juice, work out 50% of 25 litres. To work out the amount of lemonade, work out of 25 litres, etc...
3. (Original post by RDKGames)
25 litres is made up from orange juice, lemonade, and cranberry juice.

To work out the amount of orange juice, work out 50% of 25 litres. To work out the amount of lemonade, work out of 25 litres, etc...
Thank you so much!!

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4. Can someone help me on this please

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5. (Original post by z_o_e)
Can someone help me on this please

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It's a 600ml bottle of remover and you mix a 1/4 of it with 4500ml water.

So that means you mix 150ml remover with 4500ml water.

So the ratio of remover to water must be 150:4500. Can you simplify this ratio?
6. (Original post by notnek)
It's a 600ml bottle of remover and you mix a 1/4 of it with 4500ml water.

So that means you mix 150ml remover with 4500ml water.

So the ratio of remover to water must be 150:4500. Can you simplify this ratio?
30ml

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7. Help on this would be appropriated

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8. The ratio is 1:30 yes.

So if you use 750ml of water, how much remover do you need?
9. (Original post by z_o_e)
Help on this would be appropriated

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Are those your lines on the diagram? They're correct and the lines on the left of the dot should be 1.5 times the length of the lines on the right of the dot.

If you're unsure please explain why.
10. (Original post by notnek)
The ratio is 1:30 yes.

So if you use 750ml of water, how much remover do you need?
25

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11. That's correct.
12. (Original post by notnek)
Are those your lines on the diagram? They're correct and the lines on the left of the dot should be 1.5 times the length of the lines on the right of the dot.

If you're unsure please explain why.
I'm still stuck on the scale factor one. I don't know where to start from

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13. (Original post by z_o_e)
I'm still stuck on the scale factor one. I don't know where to start from

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Are those not your lines on the diagram? You start from the centre of enlargement which is the point drawn on your diagram.
14. (Original post by notnek)
Are those not your lines on the diagram? You start from the centre of enlargement which is the point drawn on your diagram.
Yep and then count each square up till the centre and times it by -0.5

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15. Can someone help me on this please

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16. (Original post by z_o_e)
Can someone help me on this please

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You're finding the lowest common multiple of 5, 8 and 12 and then seeing how many packets you need of each candle so that you have the lowest common multiple number of each candle.
Can you find the LCM?
17. (Original post by B_9710)
You're finding the lowest common multiple of 5, 8 and 12 and then seeing how many packets you need of each candle so that you have the lowest common multiple number of each candle.
Can you find the LCM?
Heya can you help me on this please

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18. (Original post by z_o_e)
Heya can you help me on this please

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You need to write each surd in terms of .

So for , you can write this as

And if you split up the root you get this

Have a go at the rest of the surds and please post your working if you get stuck.
19. (Original post by notnek)
You need to write each surd in terms of .

So for , you can write this as

And if you split up the root you get this

Have a go at the rest of the surds and please post your working if you get stuck.
I've done this so far

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20. (Original post by z_o_e)
I've done this so far

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Now you just need to combine all the like terms. You can deal with surds similar to how you deal with letters in algebra so what's this:

?

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