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 70 and 60 is 10.

Next, we need to find the average of the two numbers. The average of 70 and 60 is (70+60)/2 = 65.

Now, we can find the percentage difference by dividing the absolute difference by the average and multiplying by 100.

So, the percentage difference between 70 and 60 is (10/65) x 100 = 15.38%.

This means that 70 is 15.38% greater than 60.