Ann had 45 fliers to post around town. last week, she posted 1/3 of them. this week, she posted 2/5 of the remaining fliers. how many fliers has she still not posted?

First, Ann posted 1/3 of the 45 fliers. 1/3 * 45=15, meaning that she posted 15, leaving 30 fliers. Next, she posted 2/5 of the remaining fliers. 2/5 * 30 = 12, so she posted 12 more fliers. 30-12 is 18, so she has 18 left over.

I'm not sure exactly but my best guess would be 1/4