Posted by Anonymous on Monday, May 16, 2011 at 5:58am.
OJ is not measured in millimeters.
You probably mean milliliters (ml)
Your original liter of fruit drink contains 780 ml of water and 220 of OJ. You want to add X ml of OJ so that
220 + X = (1/2)(1000 + X)
X/2 = 500 - 220 = 280
X = 560 ml
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