\[2\frac{7}{16}y + 3\frac{5}{20}y + 1\frac{3^{\backslash 2}}{8}y =\]
\[= 3\frac{7 + 6}{16}y + 3\frac{1^{\backslash 4}}{4}y =\]
\[= 3\frac{13}{16}y + 3\frac{4}{16}y =\]
\[= 6\frac{17}{16}y = 7\frac{1}{16}y\]