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Something is wrong with the data in the question.
If one solution is 20% and the other is 40% the result of all the possible mixtures will be between 20% and 40%. It will never get lower than 20% and surely not 2%.
If you accidentally hit the "shift" key and It should be 25% then the answer is:
20 ...................15
........... 25
40......................5
you......desired.....parts
have
The calculations are in the diagonals.
|40 - 25| = 15 (parts of 20%)
|20 - 25| = 5 (parts of 40%)
Now, if 5 parts are 50 ml then 15 parts are 150 ml so the answer is 150 ml of 20%
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