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  • Math Trouble

    I was working on some practice math questions for the PSAT, but after trying it for many minutes I gave up, and looked up the answer and still dont get it. Here it is:

    18. The ratio of x to t is 5 to 8. If t = 3k, what is the ratio of x to k?

    (A) 3 to 8
    (B) 5 to 3
    (C) 5 to 8
    (D) 5 to 24
    (E) 15 to 8

    Can somebody explain how they got (E) as the answer? There must be something I'm not doing right.
    - The baby will be back -

  • #2
    Re:

    Here's how you do it:

    You know that

    x/t = 5/8.

    Now, if you solve for t, the equation becomes

    x = 5t/8 (taking t to the other side)

    Solving for t, we get

    t = 8x/5

    But we know that t = 3k

    So, we get 3k = 8x/5

    From this, we get 15k = 8x.

    Now you just get it to x/k form:

    15/8 = x/k.

    Done.

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    • #3
      you explained it a little better than i would have:

      x to t = 5 to 8, so x=5 and t=8.

      if t=8, and t=3k, then 3k=8,
      which means,
      k=8/3.

      the ration of x to k, then, is 5 to 8/3.

      multiply both sides by 3 and you get 15 to 8.
      Work Right, Fly Hard.

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      • #4
        Hell, this reminds me Math and I were not the best friends
        Alain
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        • #5
          hey.. Interesting math problems Im studying for the SATs current, and I needed a pen and paper to solve that! Thanks for some practice! Boy im nervous of verbal, math isnt hard but as some might have seen on this forum... my vberbal stinks. Currently Im memorizing Vocab words and doing reading practice
          Only the dead have seen the end of the war-Plato

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          • #6
            Originally posted by fly1346
            hey.. Interesting math problems Im studying for the SATs current, and I needed a pen and paper to solve that! Thanks for some practice! Boy im nervous of verbal, math isnt hard but as some might have seen on this forum... my vberbal stinks. Currently Im memorizing Vocab words and doing reading practice

            We don't have problems with Math...thats my fav. subject....hehehehe...Its not hard once you get the hang of it...
            ***My Blog***

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