The density of ' \( x \) ' M solution (' \( x \) ' molar) of NaOH is \( 1.12 \, \text{g mL}^{-1} \), while in molality, the concentration of the solution is \( 3 \, \text{m} \) (\( 3 \) molal). Then \( x \) is (Given: Molar mass of NaOH is \( 40 \, \text{g /mol}^{} \))
