Mack is repackaging 6/8- pound bags of birdseed into 1-pound bags of birdseed.What is the least number of 6/8 -pound bags of birdseed he needs in order to fill 1-pound bags without any leftovers?

Mack needs 4 bags. 4 x 6/8 = 24/8. Twenty-four eighths of a pound is equal to 3 pounds.