Elijah wrote his name in 15 school shirts. cora wrote her name in 15 school shirts together they labeled 10 shirt each day. on how many days did elijah and cora label shirts

From the given above, it can be noted that the number of shirts when added together will give us an answer of 30 shirts. Then, by labeling only 10 of the 30 shirts each day, they will have to work for 3 days in order to label all the shirts. Thus, the answer is 3.