SOLUTION: Please help me solve this. I've been trying this for hours now. "A jewel has five rings, each weighing 18grams, made of an alloy of 10% silver and 90% gold. He decides to melt do

Question 982426: Please help me solve this. I've been trying this for hours now.
"A jewel has five rings, each weighing 18grams, made of an alloy of 10% silver and 90% gold. He decides to melt down the rings and add enough silver to reduce the gold content to 7.5%. How much silver could he add? "

Found 2 solutions by josgarithmetic, KMST:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
5*18 grams of the alloy;

x, how many grams of silver to add

Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
The total amount of metal in that jewel amounts to
.
, so the of the rings in the jewel is gold.
The total amount of gold in that jewel amounts to
.
If that is going to be of a new total amount , then
--->---> .
Obviously the total amount of metal added was
, and all that was added silver,
so the amount of silver he could add is .
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