SOLUTION: Varun has five rings, each weighing 18 g, 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 75%%. H
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Question 904646: Varun has five rings, each weighing 18 g, 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 75%%. How much silver should he add?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
from view of gold
90*0.9=0.75*(90+x)
81=67.5+0.75*x
81-67.5=0.75*x
13.5=0.75*x
x=18
check
90*0.9=0.75*(90+x)
90*0.9=0.75*(108)
81=81
ok
or from view of silver
1*y+0.1*90=0.25(90+y)
1*y+9=22.5+0.25y
1*y-0.25y=22.5-9
0.75y=13.5
y=13.5/0.75
y=18
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