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Easy Proportion, but not for me

  1. Dec 12, 2008 #1
    EDIT: Problem Solved please delete.
     
    Last edited: Dec 12, 2008
  2. jcsd
  3. Dec 12, 2008 #2
    There's a much easier way to do it with one equation and no proportions. Practice makes word problems easier!

    .03*x+.05*(6000-x)=220
     
  4. Dec 12, 2008 #3
    Actually that looks more complicated to me. My way was right too though, right?
     
  5. Dec 12, 2008 #4
    Sure... but you can't always rely on guess and check. In this problem we see that there's a principal, a rate, and an interest. We need a problem that accomadates them and only them, and we happen to have P*r=I, which we just need to modify for our uses. Word problems are almost always best thought of as what variables you have and need, and then what equation you already know that relates them.
     
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