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Math Help - Reduction of grain by 80%.

  1. #1
    Newbie
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    Dec 2011
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    5

    Reduction of grain by 80%.

    a farmer has some grain, which he would like to have sold, but unfortunately there is very much moisture in the grain. there are actually 90% moisture in the grain and you will probably not call it corn any more , but there is a man who would like to buyit but he would only buy when the moisture percentage is down at 80%
    it is about 100 kg grain (with moisture) and the question is now how much weight grain (with moisture) when it is down to 80% moisture when the man will buy?
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  2. #2
    Junior Member
    Joined
    Jun 2011
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    56

    Re: Help!!!!

    Ok, so the grain has two components: the 'solid stuff' and the moisture. Moisture disappears during the drying process, but the mass of the solid stuff remains the same. You start out with (100\% - 90\%)\cdot 100 \mathrm{kg}=10\mathrm{kg} of solid stuff. After the drying process you still have 10 kg of solid stuff, but now it's (100\% - 80\%) of the total mass. I'll leave it up to you do the last calculation step.
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