Answer
$8lbs$
Work Step by Step
Let's say E is the weight of an object on Earth and M is the weight of an object on the Moon. Because they are directly proportionate to each other, their relationship can be written as: $E=kM$
Because when $E=200lbs$, $M=32lbs$, we are able to find k.
$k=E/M=200lbs/32lbs=6.25$
Use this k to find M when E=50lbs.
$M=E/k=50lbs/6.25=8lbs$
