To find the percentage difference between two numbers, we first need to calculate the absolute difference between them. In this case, the absolute difference between 11 and 24 is 13 (24 - 11 = 13).

Next, we need to find the average of the two numbers. The average of 11 and 24 is (11 + 24) / 2 = 17.5.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 11 and 24 is:

(13 / 17.5) x 100 = 74.29%

Therefore, the percentage difference between 11 and 24 is 74.29%. This means that 24 is 74.29% more than 11.