Monday

July 28, 2014

July 28, 2014

Posted by **julie** on Friday, April 29, 2011 at 2:26pm.

- algebra -
**Reiny**, Friday, April 29, 2011 at 2:34pmcost of gold per ounce = x

cost of silver per ounce = y

5x + 20y = 540 ---> x + 4y = 108

4x + 25y = 450

1st equation times 4

4x + 16y = 432

4x + 25y = 450

subtract them

9y = 18

y = 2

sub into x+4y = 108

x + 8 = 108

x = 100

WOW! $100 per ounce of gold

Quickly tell me where and I will be a millionaire within a few hours, lol

**Related Questions**

algebra - assume that a jeweler needs 80 grams of an alloy that is 30% gold. He ...

Chemistry - A piece of metal alloy (a solution of metals) is made of gold and ...

Algebra - A goldsmith has two gold alloys. The first alloy is 20% gold; the ...

AP Chem - A silver-copper alloy had a mass of 0.1264g. When the alloy was ...

Chemistry - A silver-copper alloy had a mass of 0.1264g. When the alloy was ...

Chemistry - The relative amount of gold in an alloy is commonly expressed in ...

Chemistry - To assay silver content in an alloy, a 13.38 g sample of alloy was ...

Chemistry - A homogenous mixture of metals is called an alloy. An alloy is found...

College Algebra - Chemistry - A goldsmith has two gold alloys. The first alloy ...

chemistry - Archimedes used density along with mass and volume of alloys (...