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 Post subject: Question help please
PostPosted: Thu Aug 23, 2018 2:23 pm 
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Joined: Thu Mar 06, 2014 2:50 pm
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A kilogram of bananas costs t pence
So 3 kilograms of bananas cost 3t pence
A kilogram of oranges costs 10p more than a kilogram of bananas

What is the cost in pence of four kilograms of oranges?

43t
44t
3t +40
4t +10
4t + 40 This is the answer Dd has marked, is this correct?

Thanks


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 2:37 pm 
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Joined: Mon Feb 12, 2007 2:21 pm
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A kilogram of bananas costs t pence
So 3 kilograms of bananas cost 3t pence
A kilogram of oranges costs 10p more than a kilogram of bananas

What is the cost in pence of four kilograms of oranges?

A kilogram of oranges is t + 10 pence

So 4kg is 4(t + 10) = 4t + 40 a bit hard for 11+ imho


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 2:41 pm 
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Thank you guest55. This is off an 11+ practice paper. Maths is not my strong point by any means but I could see some logic in dd's answer


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 2:46 pm 
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Can I check 2 more questions please.

One 20pence coin weighs 5 grams
Isabelle has 1 kilogram of 20 pence coins

What is the total value of Isabelle's coins?
Dd has put £40 but I think it's £200

A loaf weighing 400g is in th3 shape of a cuboid.
The cuboid has length 16cm, height 7cm and width 7cm.
Which is the closest estimate for the volume of 1g of the loaf.
Dd put 5cm3. I have no idea where to start in working this one out.

Thanks in advance, I promise that's it now!


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 2:56 pm 
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Posts: 1184
kal12003 wrote:
One 20pence coin weighs 5 grams Isabelle has 1 kilogram of 20 pence coins What is the total value of Isabelle's coins?


How many coins are there in 1kg? Each coin weighs 5 grams, so what is 5 divided by 1000?

If each coin in the bag is worth 20p, how much is the bag worth? The number of coins in the bag (200) times the value of each coin (20p) equals 4000p or £40.00.

So unless I've missed something, your DD is correct. Why do you think it's £200?


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 2:59 pm 
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Thank you. I am so frazzled with this maths paper. I was only getting as far as the first step I think so divided 1000 by 5 to get to 200 but clearly missed step 2! Thank you so much


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 3:02 pm 
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kal12003 wrote:
A loaf weighing 400g is in th3 shape of a cuboid. The cuboid has length 16cm, height 7cm and width 7cm.Which is the closest estimate for the volume of 1g of the loaf.


We are given the volume of 400g of loaf - it is 7x7x16. This is (I hope) 784cm cubed.

If you are rounding quite broadly, you could say that it is approximately 800cm3. That would mean that 400g=800 cm3, so 1g would be 2cm3.

I don't know what options you were given though so I don't know close the estimate is meant to be.


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 3:06 pm 
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kal12003 wrote:
A loaf weighing 400g is in th3 shape of a cuboid.
The cuboid has length 16cm, height 7cm and width 7cm.
Which is the closest estimate for the volume of 1g of the loaf.
Dd put 5cm3.

We are asked to estimate

Volume = 16 x 7 x 7

1g vol = [16 x 7 x 7]/400 approx [16 x 50]/400 which is 2 cm^3

Note I did not work out the volume, just rounded and simplified.


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 Post subject: Re: Question help please
PostPosted: Thu Aug 23, 2018 3:08 pm 
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Thank you both. Dd has her answer as 5cm3. I'm not sure how she has got to this but will show her the explanation now. Thank you both :)


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