Question

What issue did the great compromise and the Three-Fifths Compromise resolve?

Answer 1

This resolved the issue of votes in the congress during the congressional convention.
The Great Compromise was a solution that developed the seperate entities of the House of Representatives, which had a proportional representation based on population of the state, and the Senate, which had a flat rate of two representatives per state.
The Three-Fifths Compromise, as awful as it may be, achieved the same thing. There was a controversy about whether or not slaves counted when figuring out the amount of representatives a state got in the House. It was decided that a slave was worth 3/5 of a person, and that could be used to calculate House representatives for a state. 

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Answer 2

It resolved the problems of how the states should be respresented