<PRE><B>Question 159016</B>
    forty-five ounces of pure grapefruit juice are added to 30 oz of a fruit punch that is 15% grapefruit juice. what is the percent concentration of grapefruit juice in the resulting mixture
.
Amount of grapefruit juice in the 15% juice:
.15(30) = 4.5 oz
.
Total: amount of grapefruit juice:
45 + 4.5 = 49.5 oz
.
Total: amount of mixture:
45 + 30 = 75 oz
.
Percent concentration:
49.5/75 * 100 = 0.66 * 100 = 66%  </PRE>