Answer
$14\frac{1}{40}$
Work Step by Step
$3\frac{7}{8}+7\frac{2}{5}+2\frac{3}{4}$
$=3\frac{7}{8}+2\frac{6}{8}+7\frac{2}{5}$
$=5\frac{13}{8}+7\frac{2}{5}$
$=6\frac{5}{8}+7\frac{2}{5}$
$=6\frac{25}{40}+7\frac{16}{40}$
$=13\frac{41}{40}$
$=14\frac{1}{40}$