You are Here: Home >< Maths

# Urgent GCSE Maths question Watch

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

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 25, 2016
Today on TSR

### Falling in love with him

But we haven't even met!

### Top study tips for over the Christmas holidays

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.