Best Answer

V: total volume of tomato paste

Vt : tomato in this volume

First tomato paste is 38% then Vt=0.38 x V

We want the tomato volume to be the same but the total volume to change so that to obtain 28%

Vt = 0.28 x V'

So we have 0.38 x V = 0.28 x V' thus V'/V = 0.38 / 0.28 = 19/14 = 1.357

So the volume of water to be added is about 35.7% of the total volume at the beginning

Q: What quantity of water to be added to a tomato paste of 38 percent concentrate to 28 percent concentrate?

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If a quantity of kilograms is added to another quantity of kilograms, the result is a larger quantity of kilograms.If a quantity of kilograms is multiplied by another quantity of kilograms, the result has no physical significance,which is lucky, because it's not at all clear how you might go about doing that.

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