Question

If you put 30 ml of concentrate in a glass, how much water should be added?

Answer 1

Step-by-step explanation:

15 percent solution means 100 ml of solution contains 15 g of solute.that is 30 litre of solution contains 15*30/100 kg of solute which is equal to 4.5 kg of solute.now if we add water then amount of solute is not going to change.

now let the amount of water to be added be x litres.

so we have [4.5/(30+x)]=12.on solving we have x =7.5

so the answer will be that we have to add 7.5 litre of water to a 15 percent solution to concentrate it to 12 percent