Raj spent one-fourth of his salary on rent and one-third on living expenses.
Fraction of the salary spent by Raj $=\large\frac{1}{4}$$ + \large\frac{1}{3}$$ = \large\frac{3+4}{12}$$=\large\frac{7}{12}$
He saves the remaining, i.e, $=1-\large\frac{7}{12}$$ = \large\frac{12-7}{12}$$ = \large\frac{5}{12}$