Answer: 24 fliers
Explanation:
he had 80 to begin with so last week if he posted 1/4 of them he would have 3/4 left and
3/4 * 80 = 60
and then if he posts 3/5 of the 60 remaining fliers he would have 2/5 left over and
2/5 * 60 = 24
so your answer is 24 fliers