Need by today!
sterling silver is an alloy of 92.5% silver and 7.5% copper by weight. you have 15 ounces of 800 grade silver which is 80% silver and 20% copper. how much pure silver should you add to the 800 grade to make sterling silver?

is the equation for copper 0.075(15 + s) = 3 + s?

If s is the amount of pure silver you add to the alloy, then the new alloy will have a total weight of 15+s oz. You want 92.5% of this alloy to be silver, so that the amount of silver in the new alloy is 0.925(15+s).

80% of the starting 15 oz alloy was silver; this comes out to 12 oz. To this amount we are adding s. So

0.925(15+s)=12+s

and solving this tells you that you need to add s=25 oz of silver to get the sterling silver alloy.

Step-by-step explanation:

cosine

step-by-step explanation:

answer: a. 13/44

step-by-step explanation: judging by the information given to us, we are looking for experimental probability. we can see that 13 males have chosen chocolate ice cream. there are 44 ice creams in total (remember that the total is always the denominator). so our answer is 13/44.