Question 32041
Your question is impossible, as it stands.
There in no way that that you could combine two solutions such that the resulting mixture would have a greater concentration than both the original solutions.
The concentration of the mixture/combination is ALWAYS in between the concentrations of the two original solutions.
The only way to get a greater concentration (without adding another solution of higher concentration) is to boil off some of the water, or in some other way extract it.
You weren't asked this question in order to show that it was impossible, were you?