SOLUTION: An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing 100 grams of an alloy that contains 28% copper with 28 grams of pure copper. Answer the

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Question 1044621: An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing
100
grams of an alloy that contains
28%
copper with
28
grams of pure copper.
Answer the questions below. Do not do any rounding.
How many grams of copper are in the resulting mixture?
what percentage of the resulting mixture is copper?

Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing
100 grams of an alloy that contains 28% copper with 28 grams of pure copper.
--------
How many grams of copper are in the resulting mixture?
128
----------
what percentage of the resulting mixture is copper?
P = percentage
100*28 + 28*100 = P*128
P = 5600/128 = 43.75%

Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.
An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing 100 grams of an alloy that contains 28% copper
with 28 grams of pure copper.
Answer the questions below. Do not do any rounding.
How many grams of copper are in the resulting mixture?
what percentage of the resulting mixture is copper?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1.  There are  %2828%2F100%29%2A100+%2B+28 = 28 + 28 = 56 grams of copper in the resulting alloy.

2.  The copper percentage is 56/(100+28) = 56%2F128 = 0.4375 = 43.75% in the resulting alloy.

On alloy mixture problems see the lesson
    - Word problems on mixtures for alloys
in this site.

For mixture problems see all associated lessons with it.