<PRE><B>Question 961261</B>
How many g of gold should a coin of 53% gold be if when combined with a 5 g pure gold necklace, it forms a metal that is 76% gold?
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Equation:
gold + gold = gold
0.53x + 1*5 = 0.76(x+5)
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Multiply thru by 100 to get::
53x + 100*5 = 76*x + 76*5
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23x = 24*5
x = 5.217 grams (amt of 53% gold to add)
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Cheers,
Stan H.</PRE>