Final answer:
John still has 48 flyers left to post.
Step-by-step explanation:
To find out how many flyers John has still not posted, we need to subtract the number of flyers he has already posted from the total number of flyers. Last week, John posted 1/4 of the 96 flyers, which is 96 * (1/4) = 24 flyers. This means that John has 96 - 24 = 72 flyers remaining. This week, John posted 1/3 of the remaining flyers, which is 72 * (1/3) = 24 flyers. So, John has 72 - 24 = 48 flyers still not posted.