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

a jeweler purchased 5 oz of a gold alloy and 20 oz of a silver alloy for a total cost of $540. The next day at the same price per ounce, the jeweler purchased 4 oz of th egold alloy and 25 oz of the silver alloy for a total cost of $450. Find the cost per ounce of the gold and silver alloys.

- algebra -
**Reiny**, Friday, April 29, 2011 at 2:34pm
cost 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

## Answer This Question

## Related Questions

- algebra - A jeweler wants to make a silver alloy to be used to make necklaces. ...
- math - A jeweler wants to make a silver alloy to be used to make necklaces. How ...
- math - A jeweler wants to make a silver alloy to be used to make necklaces. How ...
- Algebra 1 - A jeweler buys gold jewelry and resells the gold to a refinery. The ...
- algebra - assume that a jeweler needs 80 grams of an alloy that is 30% gold. He ...
- chemistry - A 14 karat gold alloy contains 58% m/m gold. How much of this alloy ...
- pre calc - A jeweler wants to make a 1 ounce ring composed of gold and silver, ...
- Chemistry - A piece of metal alloy (a solution of metals) is made of gold and ...
- Algebra 1 - In 2000, the internatonal price of gold was $270 per ounce, and the ...
- algebra - A chemist has x grams of an alloy that is 20% silver and 10% gold, and...

More Related Questions