Question

Tina would like to melt down her existing gold jewelry to make a 20 ounce gold necklace that is 90% pure gold. After melting her jewelry, she is left with two batches. One batch is 75% pure. The other batch is 96% pure. How much of the 96% pure melted gold should Tina mix with the 75% pure melted gold to obtain 20 ounces of 90% pure gold?
A.
5.71 ounces
B.
7.00 ounces
C.
14.29 ounces
D.
13.00 ounces

Answer 1

@jim_thompson5910 One More ? :)

Answer 2

@boricua86 ?

Answer 3

None of these answers seem justifiable.

Answer 4

@thomaster PLEASE HELP

Answer 5

Thats What I Thought @boricua86

Answer 6

I feel like it is missing information. Like how much gold do we have initially? We know the concentration of the gold in the two batches but no amounts, all we know is that we need 20 ounces of gold at 90%.

Answer 7

It's Not Missing Anything.... ? Im Confused On This Question. Any Thoughts @thomaster ?

Answer 8

boricua86 is right, I think the options should give 2 values, 1 for the ounces of 96% gold and 1 for the ounces of 75% gold

Answer 9

Thank you for clarifying @thomaster

Answer 10

No, I think the question is fine... after looking again.
When you use 5.71 ounces of 96% gold, there's 14.29 ounces of 75% gold needed to make 20 ounces :)

Answer 11

Ahhh I see, Two choice options? Man, thats thinking way outside the box lol.