Question

In what proportion should you combine a 2:5 soaking solution and distilled water to create a 300 ml of a 1:20 solution?

Answer 1

orig ratio: 2.5 final ratio 20
so you want to dilute it 20/2.5=8 times
which means you need one part original, and 7 parts water.

one part=300ml/8=you do it.
7 parts= 300ml*7/8