Answer
16 boxes
Work Step by Step
(Let n be the number of boxes to be carried in the elevator. Multiply this times 50 since each box is 50 lbs. Add 160 since the delivery person is 160 lbs. The total weight is 1000lbs.)
$50n+160=1000$
(To solve, subtract 160 from each side)
$50n=840$
(Divide each side by 50)
$n=16\frac{4}{5}$
(Since boxes cannot come in a fraction, the answer is simply 16)
