A solution of common salt in water is prepared by adding $20$ kg of pure salt $6$ to $100$ kg of water $($specific gravity of solution is $1\mathrm{.}23).$ Calculate the concentration of common salt in this solution as $($a$)$ weight fraction $($b$)$ weight $/$volume$.$ If this common salt solution is mixed with $100$ Kg of another common salt solution of strength $5$ M $($specific gravity of $1\mathrm{.}38),$ calculate the mass fraction of common salt in the resultant solution and also the weight of obtained solution. Represent the process on block diagram and also perform degrees of freedom analysis