Brass is made from a mixture of copper and other elements. A mixture that is 80% copper is combined with a mixture that is 60% copper, resulting in 100 pounds of brass that is 65% copper. Which equation can be used to find x , the amount of 60 percent mixture used to create the 65 percent mixture?
Answer
A
0 point 6 times open paren 100 minus x close paren plus 0 point 8 x is equal to 100 times 0 point 6 5
B
0 point 6 times x plus 0 point 8 times open paren 100 plus x close paren is equal to 0 point 6 5
C
0 point 8 repeating 100 plus 0 point 6 x is equal to 0 point 6 5 times open paren 100 minus x close paren
D
0 point 8 times open paren 100 minus x close paren plus 0 point 6 x is equal to 100 times 0 point 6 5