How much water must be added to a 4-liter solution that contains 5% extract of banberry to get a solution that contains 2% extract of banberry?

Question

Trying to find how much water should be added in liters

Answer 1

0.05*4 + 0*x = 0.02(x+4)

0.2 = 0.02x + 0.08

0.12 = 0.02x

12 = 2x

x=6

check:

there is 0.05(4) = 0.2 liters of banberry in the original solution.

after adding 6 liters of water there is 0.2/10 = 0.02 = 2%

6 liters of water