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c4thegoat
25.04.2021 •
Mathematics
Corresponding parts help me please
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Ответ:
No; 0.075(15 + s) = 3; s = 25 oz
Step-by-step explanation:
No, but you are close.
The mass of copper in your 800 grade silver is
Mass = 0.20 × 15 = 3 oz
You are adding s oz of silver so that 7.5 % of the total mass is still 3 oz of copper.
The equation becomes
0.075(15 + s) = 3 Divide both sides by 0.075
15 + s = 40 Subtract 15 from each side
s = 25 oz
You add 25 oz of silver to your 800 grade alloy to get sterling .
Check:
0.075(15 + 25) = 3
0.075 × 40 = 3
3 = 3