To find the percentage difference between two numbers, we first need to find the absolute difference between them. In this case, the absolute difference between 190 and 240 is 50 (240 - 190 = 50).

Next, we need to find the average of the two numbers. The average of 190 and 240 is (190 + 240) / 2 = 215.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 190 and 240 is (50 / 215) x 100 = 23.26%.

This means that the second number (240) is 23.26% greater than the first number (190). Alternatively, we could say that the first number (190) is 18.6% less than the second number (240).