Answer:
23.42 pounds of the alloy with 26% copper
29.58 pounds of the alloy with 69% copper
Step-by-step explanation:
Let's call X the number of pounds of the alloy with 26% copper and Y the number of pounds of the alloy with 69% copper.
We need 53 pounds of the third alloy, so we can write the following equation:
X + Y = 53
Additionally, the third alloy should be 50% copper. So, the second equation is:
0.26X + 0.69Y = 0.5(53)
0.26X + 0.69Y = 26.5
Now, we can solve for X in the first equation and replace it on the second:
So, solving for Y, we get:
Then, the value of X is:
Therefore, you need to use 23.42 pounds of the alloy with 26% copper and 29.58 pounds of the alloy with 69% copper