SUM of \[\frac{3}{4}+\frac{7}{6}+1\frac{3}{5},\] find the L.C.M. of the denominators and then add them. L.C.M. of 4, 5 and 6 is 60. Then, \[\frac{3}{4}+\frac{7}{6}+\frac{8}{5}=\frac{45+70+96}{60}=\frac{211}{60}=\frac{211\times 2}{60\times 2}=\frac{422}{120}\]