SOLUTION: In 60 ounces of alloy for watch cases there are 20 ounces of gold >how much copper must be added to the allow so that a watch case weighing 4 ounces , made from the new allo, will
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Question 1062376: In 60 ounces of alloy for watch cases there are 20 ounces of gold >how much copper must be added to the allow so that a watch case weighing 4 ounces , made from the new allo, will contain exactl 1 ounce of gold
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Originally, gold/aloy = 20/60 =
4 ounces of the alloy has
ounce of gold
ounces of alloy
---------------------------
multiply both sides by
2.667 ounces of copper must be added
to the 4 ounces of alloy
---------------------------
check:
OK
Check the math & get another opinion, too
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