Question

Delegates at the Constitutional Convention of 1787 agreed to the Three-fifths Compromise to solve a dispute directly related to

Answer 1

Delegates at the Constitutional Convention of 1787 agreed to the Three-fifths Compromise to solve a dispute directly related to "state representation in Congress", since delegates were divided over how the slave population should be counted in Congress.

Answer 2

Answer:  How the population of states would be counted in regard to states that permitted slavery.  

Details:

At the Constitutional Convention in 1787, the Three-Fifths Compromise was a way of accounting (somewhat) for the population of slaves in states that permitted slavery.  For taxation and representation purposes, the question was whether slaves should count in the population figures.  (They were not considered voting citizens at that time.)   The Three-Fifths Compromise said that three out of every five slaves could be counted when determining a state's population size for determining how many seats that state would receive in the House of Representatives.