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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
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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Claire4christBest ResponseYou've already chosen the best response.0
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

andriod09Best ResponseYou've already chosen the best response.0
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

Claire4christBest ResponseYou've already chosen the best response.0
sorry its not clear to me i can't see the top number
 one year ago

andriod09Best ResponseYou've already chosen the best response.0
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

Claire4christBest ResponseYou've already chosen the best response.0
so its (0.15)(20) (10%)(x) (0.12)(x+10)
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
15 * 20 + 10x = 12 ( 20 + x) @Claire4christ Can you continue?
 one year ago

Claire4christBest ResponseYou've already chosen the best response.0
did you see example above???
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
If you are talking about your post, then it's WRONG!
 one year ago

Claire4christBest ResponseYou've already chosen the best response.0
that's one of the examples
 one year ago

Claire4christBest ResponseYou've already chosen the best response.0
do you see where it says problem 1 that;s the example
 one year ago

Claire4christBest ResponseYou've already chosen the best response.0
can u explain me than plz
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
I just show you the result equation, then you solve it yourself!
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
Multiply the percentage with its mass :)
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
Is it clear to you now?
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
15 * 20 + 10x = 12 ( 20 + x) 300 + 10x = 240 + 12x
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
Do you understand my calculation above?
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
Where do you get 60+10x=2x?
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
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

ChlorophyllBest ResponseYou've already chosen the best response.1
Now I hope you're fine with x = ...?
 one year ago

Claire4christBest ResponseYou've already chosen the best response.0
how did you get 15
 one year ago

ChlorophyllBest ResponseYou've already chosen the best response.1
I just make your life easier by multiplying all with 100 :)
 one year ago
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