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# Urgent GCSE Maths question

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1. What's the answer to this and why? Could someone explain please?
2. (Original post by epoddoulc)
We're nt really suppose to you the answers but what have you done so far?
3. You need to work out the volume of the prism first...work out the area of the trapezium then multiply by the length of the prism.

Then you'll work out the mass using the volume..
4. Work out volume
Multiply by density
Convert to kilos

If you don't get it, look at the unit and see how they cancel

5. here.
6. This is how my brother came about doing it, but it's incomplete because he doesn't know how to convert into kilograms.

1/2 (a+b) h Area of a trapezium
(8+12 divided by 2) 6
20/2=10
10 multiplied by 6= 60 cm
60 multiplied by 20= 1200cm
1200 multiplied by 5= 6000
7. (Original post by epoddoulc)
A bit easier to follow
- I hope
8. You first need to keep in mind the formula for the mass, which is mass = volume * density.

Now that you know that formula you need to find the volume and the density which has already been given to you 5 g/cm3.

To find the volume you do the area of the cross section * the length of the shape. You know that the area of the cross section is found by using the formula for the trapezium which is ((Base 1 + Base 2)*Height)/2. Therefore you do ((8+12)*6)/2 = 1200 cm3.

Now that you know the volume you can find the mass by doing volume * density, therefore 1200 * 5 = 6000 grams.

6000 grams = 6Kg

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