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Math Help - help with pyramid and rectangle

  1. #1
    Member helloying's Avatar
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    help with pyramid and rectangle

    teach me how to do the 1st part. the ans given is 2. but i got 1.5.

    i think since the vol of pyramid is one-third of the rectangle, i'll let its vol to be 1 unit while the rectangle is 3 units. then i take 6 divide by 4 to get ans.
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  2. #2
    MHF Contributor
    Grandad's Avatar
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    Hello helloying
    Quote Originally Posted by helloying View Post
    teach me how to do the 1st part. the ans given is 2. but i got 1.5.

    i think since the vol of pyramid is one-third of the rectangle, i'll let its vol to be 1 unit while the rectangle is 3 units. then i take 6 divide by 4 to get ans.
    The clue is in the question - but you didn't read it properly! It's a prism, not a pyramid. Therefore, its volume is one-half that of the cuboid, not one-third. Hence it occupies one-third of the total volume, not one-quarter.

    Grandad
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