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Claire4christ Group Title

And i need help with these problem. An alloy of tin is 15% tin and weighs 20 pounds. A second alloy is 10% tin. How much (to the nearest tenth lb.) of the second alloy must be added to the first alloy to get a 12% mixture. ______ pounds

  • one year ago
  • one year ago

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  1. Claire4christ Group Title
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    Problem 1: A jeweler is using an alloy, a mixture of metals. He has 10 pounds of the alloy. 2% is the rare metal robium. He has another source which is 5% robium. He wishes to combine these mixtures to form a mixture that is 3% robium. Solution: 1. Identify the variables. (0.02)(10) The quantity of robium in material 1 (5%)(x) The quantity of robium in material 2 (0.03)(x+10) The quantity of the desired mixture 2. Write an equation. 5% x + (0.02)(10) = (0.03)(x+10) The equation required. 3. Perform the Solution. 0.05x + 0.2 = .03x + 0.3 = 0.02x = 0.1 4. Write the answer. x = 5 The desired amount.

    • one year ago
  2. andriod09 Group Title
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    just do what i did. use the percent bar, then the butterfly method. want me to start for you? here: |dw:1349374188909:dw|

    • one year ago
  3. Claire4christ Group Title
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    sorry its not clear to me i can't see the top number

    • one year ago
  4. andriod09 Group Title
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    at the very top, it isn't a number, its the % symbol. all you do is fill it in, the top number, is the number your trying to find, x, the bottom number, not the 100, is the total, then you put what percent you are trying to find below the percent sign and above the 100.

    • one year ago
  5. Claire4christ Group Title
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    so its (0.15)(20) (10%)(x) (0.12)(x+10)

    • one year ago
  6. Chlorophyll Group Title
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    15 * 20 + 10x = 12 ( 20 + x) @Claire4christ Can you continue?

    • one year ago
  7. Claire4christ Group Title
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    did you see example above???

    • one year ago
  8. Chlorophyll Group Title
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    If you are talking about your post, then it's WRONG!

    • one year ago
  9. Claire4christ Group Title
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    that's one of the examples

    • one year ago
  10. Claire4christ Group Title
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    do you see where it says problem 1 that;s the example

    • one year ago
  11. Claire4christ Group Title
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    can u explain me than plz

    • one year ago
  12. Chlorophyll Group Title
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    I just show you the result equation, then you solve it yourself!

    • one year ago
  13. Chlorophyll Group Title
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    Multiply the percentage with its mass :)

    • one year ago
  14. Chlorophyll Group Title
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    Is it clear to you now?

    • one year ago
  15. Claire4christ Group Title
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    300+10x=240=2x

    • one year ago
  16. Claire4christ Group Title
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    300+240???

    • one year ago
  17. Claire4christ Group Title
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    60

    • one year ago
  18. Chlorophyll Group Title
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    15 * 20 + 10x = 12 ( 20 + x) 300 + 10x = 240 + 12x

    • one year ago
  19. Claire4christ Group Title
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    60+10x=2x

    • one year ago
  20. Chlorophyll Group Title
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    Do you understand my calculation above?

    • one year ago
  21. Claire4christ Group Title
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    yes

    • one year ago
  22. Chlorophyll Group Title
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    Where do you get 60+10x=2x?

    • one year ago
  23. Claire4christ Group Title
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    300-240???

    • one year ago
  24. Chlorophyll Group Title
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    15 * 20 + 10x = 12 ( 20 + x) 300 + 10x = 240 + 12x -> 2x = 60 You should make each line worth your while, instead of jumping all over !!!

    • one year ago
  25. Chlorophyll Group Title
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    Now I hope you're fine with x = ...?

    • one year ago
  26. Claire4christ Group Title
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    30

    • one year ago
  27. Claire4christ Group Title
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    how did you get 15

    • one year ago
  28. Chlorophyll Group Title
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    15%

    • one year ago
  29. Chlorophyll Group Title
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    I just make your life easier by multiplying all with 100 :)

    • one year ago
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