Answer
a) 73 boxes
b) 4 trips
Work Step by Step
a)
$4000\geq 210 + 95 + 50x$
$4000\geq 305 + 50x$
$4000-305\geq 305-305 + 50x$
$3695 \geq 50x$
$3695/50 \geq 50x/50$
$73.9 \geq x$
At most, 73 boxes can be moved in one trip.
b)
$275/73 = x$
$3.767 = x$
4 trips are needed.
