Hisham A. answered 06/20/15
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This looks like a conversion & addition problem. I don't think the fact that its about paint affects the math.
1 litre = 1000 ml.
1.8 litres = 1.8 * 1000 = 1800 ml.
1800 ml + 600 ml = 2400 ml.
So he has made 2400 ml of grey paint.
David W.
06/20/15