OpenStudy (anonymous):

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

3 years ago
OpenStudy (nikato):

|dw:1388535102646:dw|

3 years ago
OpenStudy (nikato):

@taryn_leeanne just solve for x 0.75(20-x)+0.96x=0.90(20)

3 years ago
OpenStudy (anonymous):

C

3 years ago
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