anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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.
andriod09
  • andriod09
just do what i did. use the percent bar, then the butterfly method. want me to start for you? here: |dw:1349374188909:dw|
anonymous
  • anonymous
sorry its not clear to me i can't see the top number

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andriod09
  • andriod09
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.
anonymous
  • anonymous
so its (0.15)(20) (10%)(x) (0.12)(x+10)
anonymous
  • anonymous
15 * 20 + 10x = 12 ( 20 + x) @Claire4christ Can you continue?
anonymous
  • anonymous
did you see example above???
anonymous
  • anonymous
If you are talking about your post, then it's WRONG!
anonymous
  • anonymous
that's one of the examples
anonymous
  • anonymous
do you see where it says problem 1 that;s the example
anonymous
  • anonymous
can u explain me than plz
anonymous
  • anonymous
I just show you the result equation, then you solve it yourself!
anonymous
  • anonymous
Multiply the percentage with its mass :)
anonymous
  • anonymous
Is it clear to you now?
anonymous
  • anonymous
300+10x=240=2x
anonymous
  • anonymous
300+240???
anonymous
  • anonymous
60
anonymous
  • anonymous
15 * 20 + 10x = 12 ( 20 + x) 300 + 10x = 240 + 12x
anonymous
  • anonymous
60+10x=2x
anonymous
  • anonymous
Do you understand my calculation above?
anonymous
  • anonymous
yes
anonymous
  • anonymous
Where do you get 60+10x=2x?
anonymous
  • anonymous
300-240???
anonymous
  • anonymous
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 !!!
anonymous
  • anonymous
Now I hope you're fine with x = ...?
anonymous
  • anonymous
30
anonymous
  • anonymous
how did you get 15
anonymous
  • anonymous
15%
anonymous
  • anonymous
I just make your life easier by multiplying all with 100 :)

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