Answer
Total pounds of marketable potatoes=1,575 potatoes
Work Step by Step
First, find total number of hills in all 7 rows by multiplying 75 with 7.
$7\times75$ hills
Next, find total number of potatoes that can be produced by all the potato hills by multiplying 3lb for each potato hill with total number of potato hills.
$7\times75\times 3=1,575$ potatoes
Total pounds of marketable potatoes=1,575 potatoes