Universal dilution and mixing two solutions calculator:

applicable for mixing two solutions with various concentrations  (molar or %, or other), as well as for various pH
or mixing with solvent like water

What is molar concentration of solution prepared by mixing 100 mL 10% and 130 mL of 15% sodium hydroxide?
There is nothing difficult in the question, let's try solution mixer:

"Stock concentration:" - 15;
"Solvent concentration :" - 10,
"Final concentration:"  -  empty space ("0" is not equal to "empty"; empty for unknown; “0” is value)
"Volume of the solvent: " - 100,
"Volume of the stock: " - 130
and  press "Calculate".

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