6 L and 6000 ml
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Do you mean "what is 3/50 of a litre?" Otherwice I cannot make sense of the question. a litre is 1000ml. 1000/50 x 3 is 60ml or 0.06 litres
60ml x 15 drops/ml = 900 total drops 900 total drops divided by 60 minutes (1 hour) = 15 drops per minute
Let Q be the quantity of 80% solution required then (300 - Q) is the quantity of 30% solution as together the two solutions must equal 300. Then, [80 x Q] + [30 x (300 - Q)] = [40 x 300] 80Q + 9000 - 30Q = 12000 50Q = 3000 Q = 60...........which means (300 - Q) = 240 60ml of 80% acid solution + 240ml of 30% solution produces 300ml of 40% solution.