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Claire4christ

  • 2 years ago

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

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  1. Claire4christ
    • 2 years ago
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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.

  2. andriod09
    • 2 years ago
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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|

  3. Claire4christ
    • 2 years ago
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    sorry its not clear to me i can't see the top number

  4. andriod09
    • 2 years ago
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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.

  5. Claire4christ
    • 2 years ago
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    so its (0.15)(20) (10%)(x) (0.12)(x+10)

  6. Chlorophyll
    • 2 years ago
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    15 * 20 + 10x = 12 ( 20 + x) @Claire4christ Can you continue?

  7. Claire4christ
    • 2 years ago
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    did you see example above???

  8. Chlorophyll
    • 2 years ago
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    If you are talking about your post, then it's WRONG!

  9. Claire4christ
    • 2 years ago
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    that's one of the examples

  10. Claire4christ
    • 2 years ago
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    do you see where it says problem 1 that;s the example

  11. Claire4christ
    • 2 years ago
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    can u explain me than plz

  12. Chlorophyll
    • 2 years ago
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    I just show you the result equation, then you solve it yourself!

  13. Chlorophyll
    • 2 years ago
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    Multiply the percentage with its mass :)

  14. Chlorophyll
    • 2 years ago
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    Is it clear to you now?

  15. Claire4christ
    • 2 years ago
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    300+10x=240=2x

  16. Claire4christ
    • 2 years ago
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    300+240???

  17. Claire4christ
    • 2 years ago
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    60

  18. Chlorophyll
    • 2 years ago
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    15 * 20 + 10x = 12 ( 20 + x) 300 + 10x = 240 + 12x

  19. Claire4christ
    • 2 years ago
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    60+10x=2x

  20. Chlorophyll
    • 2 years ago
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    Do you understand my calculation above?

  21. Claire4christ
    • 2 years ago
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    yes

  22. Chlorophyll
    • 2 years ago
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    Where do you get 60+10x=2x?

  23. Claire4christ
    • 2 years ago
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    300-240???

  24. Chlorophyll
    • 2 years ago
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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 !!!

  25. Chlorophyll
    • 2 years ago
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    Now I hope you're fine with x = ...?

  26. Claire4christ
    • 2 years ago
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    30

  27. Claire4christ
    • 2 years ago
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    how did you get 15

  28. Chlorophyll
    • 2 years ago
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    15%

  29. Chlorophyll
    • 2 years ago
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    I just make your life easier by multiplying all with 100 :)

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