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Math Help - making concrete

  1. #1
    mat
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    Cool making concrete

    hi
    I have to make a concrete base which is 1.68 metres cubed.
    How do i work how much cement, sand and gravel to use in metric system?
    so 1 part cement to 2 parts sand and 3 parts gravel.
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  2. #2
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    Quote Originally Posted by mat View Post
    hi
    I have to make a concrete base which is 1.68 metres cubed.
    How do i work how much cement, sand and gravel to use in metric system?
    so 1 part cement to 2 parts sand and 3 parts gravel.
    All together there are 6 parts. That means the complete mixture contains:

    \underbrace{\dfrac16 \cdot 1.68\ m^3}_{cement} + \underbrace{\dfrac26 \cdot 1.68\ m^3}_{sand} + \underbrace{\dfrac36 \cdot 1.68\ m^3}_{gravel}
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