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Sterling Silver

by sanju09 » Wed May 19, 2010 4:00 am
Sterling Silver is 92.5 percent pure silver. How many grams of Sterling Silver must be mixed to a 90 percent Silver alloy to obtain a 500 gram of 91 percent Silver alloy?
(A) 100
(B) 120
(C) 135
(D) 190
(E) 200
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by liferocks » Wed May 19, 2010 4:07 am
Sterling Silver-----Silver alloy
----92.5----------------90------
----------------91----------------
----1--------------------1.5------

so the ratio of Sterling Silver:Silver alloy=1:1.5 or 2:3

so in 500gm we need to add 500*2/3=200gm Sterling Silver

Ans option E
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by sanju09 » Wed May 19, 2010 4:11 am
liferocks wrote:Sterling Silver-----Silver alloy
----92.5----------------90------
----------------91----------------
----1--------------------1.5------

so the ratio of Sterling Silver:Silver alloy=1:1.5 or 2:3

so in 500gm we need to add 500*2/3=200gm Sterling Silver

Ans option E
are you sure with 2/3 above?
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by liferocks » Wed May 19, 2010 4:41 am
sanju09 wrote:
liferocks wrote:Sterling Silver-----Silver alloy
----92.5----------------90------
----------------91----------------
----1--------------------1.5------

so the ratio of Sterling Silver:Silver alloy=1:1.5 or 2:3

so in 500gm we need to add 500*2/3=200gm Sterling Silver

Ans option E
are you sure with 2/3 above?
oh.sorry..I meant 500*2/5=200.
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by gmatjedi » Wed May 19, 2010 5:35 pm
0.925x+0.9(500-x)=0.91(500)
x=200
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