That, apparently, is one of a number of questions on a math assignment being used in the Beaver Ridge Elementary School in Norcross, part of the Gwinnett County, Georgia, School District. It was said to be a cross-curricular activity. This is part of one of the newer ways of teaching math … use the math in context of real life situations, etc. etc. Unfortuantely, this attempt at linking math to history class looks more like a helpful exercise for future plantation owners … of the Antebellum period.
A vice principle has collected the assignment and filed them in the shredder.
Also, it is no “how much would each slave pick” but rather “how many would each slave pick.”