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Math Help - help asap!

  1. #1
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    help asap!

    "A group of school kids are holding a school fundraiser by selling chocolates. To make the chocolate look appealing, they've decided to use a triangular prism shaped bar. Each bar will be wrapped in foil and they will be sold in boxes of 15 bars.For this chocolate mix, 1 cm^3 of chocolate has a mass of 0.6 grams."

    The dimensions of each bar are 2.6 cm in height, 13 cm in length, 3 cm in base and two 3 cm sides. An example of this shape can be found here:Surface Area and Volume of a Isosceles Triangular Prism, Page 6

    The tasks are the following:
    * Find the volume of the chocolate bar mould
    * Find the mass of chocolate needed for each bar in grams (g)
    * Find the minimum amount of foil needed to wrap each bar
    * Find a suitable sized box to hold 15 bars of chocolate

    Can someone help me and show how it's done can't get over with it I'm stuck!
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  2. #2
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    Re: help asap!

    Have you started by drawing a diagram of a chocolate bar?

    Hints:
    - The volume of a prism is equal to the product of its cross sectional area with its height.
    - Surely if you know the volume and you know the mass per cubic centimetre, you can find the mass of the chocolate bar.
    - To find the surface area, a good strategy is to draw a net of your shape and evaluating the area of the net.
    - How could the chocolate bars fit together? What would be the dimensions of this resulting shape?
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  3. #3
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    Re: help asap!

    You are told to use the equations for "Surface Area and Volume of a Isosceles Triangular Prism, Page 6". What are those equations?
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    Re: help asap!

    I post a pic of it there's a chocolate diagram
    Last edited by eddward; August 16th 2014 at 01:11 PM.
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  5. #5
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    Re: help asap!

    Cant post the picture but its a triangular prism similar to Toblerone chocolate 2.6 cm in height, 13 cm in length, 3 cm in base and two 3 cm sides.
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  6. #6
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    Re: help asap!

    A picture is not important. What is important is showing what equations you have on "Surface Area and Volume of a Isosceles Triangular Prism, Page 6" and showing what you have tried.
    Thanks from topsquark
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  7. #7
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    Re: help asap!

    I disagree, a picture is very important. Clearly the OP is having a LOT of trouble visualising this.
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  8. #8
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    Re: help asap!

    Surface Area and Volume of a Isosceles Triangular Prism attached similar shape height of it is 2.6cm, base of it is 3 cm. length of it is 13 cm. and sides of it is 3 cm. task is

    Find the volume of the chocolate bar mould
    * Find the mass of chocolate needed for each bar in grams (g)
    * Find the minimum amount of foil needed to wrap each bar
    * Find a suitable sized box to hold 15 bars of chocolate
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  9. #9
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    Re: help asap!

    can someone pls help me solve this? ((
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  10. #10
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    Re: help asap!

    Have you bothered to read my hints at all?
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  11. #11
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    Re: help asap!

    Quote Originally Posted by Prove It View Post
    Have you bothered to read my hints at all?
    you were supposed to have this turned into his teacher by now!
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    Re: help asap!

    Quote Originally Posted by romsek View Post
    you were supposed to have this turned into his teacher by now!
    As a teacher, very little annoys me more than a student who doesn't even bother to try anything, especially when the instructions have already been given!
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  13. #13
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    Re: help asap!

    okay sorry guys. anyways this is what I tried solving. 1 getting the volume v=b x h so what I did is half of the 3cm which is my base x 2.6 which is my height and x the length of my triangular prism which is 13 and in total I got V=50.7cm just not sure if im on the right track. now im just confuse getting the mass given instructions 1cm^3 of chocolate has a mass of 0.6 grams im thingking mass= density x volume? thanks guys! and thank you (prove it) for the hints
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  14. #14
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    Re: help asap!

    Thanks for the hint prove it. so I got the volume of 50.7 should I multiply 0.6 grams as it says on the statement?
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  15. #15
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    Re: help asap!

    *the minimum amount of foil needed to wrap each bar? given instruction says each bar will be wrapped in foil and they will be sold in boxes of 15 bars. should I just put 15foils? and * a suitable sized box to hold 15 bars of chocolate? thanks heaps guys!
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