Some Basic Concepts · Acid base titration stoichiometry

x mg of pure HCl was used to make an aqueous solution. 25.0 mL of 0.1 M $\ce{Ba(OH)2}$ solution is used when the HCl solution was titrated against it. The numerical value of x is $\times\,10^{-1}$. (Nearest integer)

Given : Molar mass of HCl and $\ce{Ba(OH)2}$ are 36.5 and 171.0 g mol$^{-1}$ respectively.