Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Claire4christ

  • 2 years ago

Example 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.

  • This Question is Closed
  1. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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

  2. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (0.15)(20) (10%)(x) (0.12)(x+20)

  3. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so far right???

  4. mikaa_toxica13
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yess :)

  5. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so next 10%x(0.15)(20)=(0.12)(x+20) right

  6. mikaa_toxica13
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yess. seems like you have it figured out.

  7. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    im confuse on last part

  8. andriod09
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    What do you need now Claire?

  9. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    perform the solution

  10. mikaa_toxica13
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hrmmm i got .7 ?

  11. andriod09
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you mean solve the following: \[.1x(.15)(.20)=(.12)(x+20)?\]

  12. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    .10x+3=.12x+2.4=

  13. andriod09
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    .10=.1 its 10, you don't need the 0, but it could be easier. to solve. \[.1x+3=.12x+2.4\]\[.1x+.6=.12x\]\[.6=.11x\]\[x=1.833\infty(3)\]

  14. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so how did you get .6

  15. andriod09
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    .06* my bad 1 sec. \[.1x+.06=.12x\][\.06=.11x\]\[1.833\infty(3)=x\] oddly,its the same answer.

  16. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1.8 pounds???

  17. andriod09
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you could always use the percent bar method. that's easiest.

  18. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so im confused how many pounds.

  19. andriod09
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 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. |dw:1349373397808:dw|

  20. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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

  21. andriod09
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i really hate percents just so you know. lol but ill help. just post ina new question, and don't forget to givethe best response medal.

  22. Claire4christ
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i will give bunch of them if you help me lol

  23. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.