Solve The Math Problem?

Moe and Joe haved worked a mining claim for several years. All of the gold they found has been melted into a single brick 12cm x 15cm x 4cm. Moe and Joe figure that one of them has done 2/3 of the work and should get 2/3 of the gold. The other has done 1/3 of the work and should get 1/3 of the gold. Show two different ways to divide the brick so that each miner gets a fair share.