Answer
4100
Work Step by Step
$5925\approx5900\ \ \ \ \ \longrightarrow$ tens position is not 5 or greater, round down
$1787\approx1800\ \longrightarrow$ tens position is 5 or greater, round up
$\ \ \ 5900$
$\underline{-1800}$
$\ \ \ 4100$