Free GMAT Practice Question

A bin contains only red tiles and blue tiles, in the ratio 5 red tiles to 3 blue tiles. After 24 red tiles are removed from the bin and 12 blue tiles are added to it, the bin contains equally many red tiles and blue tiles.

In the table, select the number of Red tiles and the number of Blue tiles the bin contained before those changes. Make only two selections, one in each column.