Question

how much of a 10% syrup solution should be added to 2 liters of a 30% syrup solution to get 20% syrup solution?

Answer 1

10x + 30(2) = 20(x + 2)
10x + 60 = 20x + 40
10x = 20
answer
x = 2 liters
So you would need 2 liters of the 10% solution to make the 30% solution 20%.