Mrs. Barnes teaches an art class. Before school started, she received a new supply of paper. She received 24 reams of white paper, 30 reams reams of blue paper, and 18 reams of yellow paper. She has three shelves. She wants to divide the reams of paper so that every shelf has the same number of reams stored it with no reams left over. What is the maximum number of reams of each color Mrs. Barnes can store on each shelf?