define a solution. if 10ml of h2so4 is dissolved in 90ml of water,calculate the concentration of solution

A solution is a homogenous mixture of two or more than two pure matter.Eg., salt solution, air, alloy(controversial) etc.
Given: 
volume of solute = 10 ml
volume of solvent = 90 ml
concentration of solution = ?
Formula used:
v/v% = (volume of solute/ volume of solution) x 100
Solution:
v/v% = (10/90+10) x100
          = 10% (Ans.)