Question

You have one liter of lemonade concentrate that contains 10% sugar. you pour one fourth of it into a pitcher and you add water to make the final volume one liter, what is the percentage of sugar in the new pitcher?

Answer 1

Originally:
Total liquid volume = 1 L
Sugar volume  = 10% of 1L = 0.1 L

Finally:
Sugar volume = (1/4) of 0.1 L = 0.025 L
Total liquid volume = 1 L
Percentage of sugar = 100*0.025 = 2.5%

Answer: 2.5%