A medical lab collected two blood samples, one with {715478}715478 blood cells and one with {1}{522668}1522668 blood cells. How many more blood cells did the second sample have?

strange way to write numbers, but I would simply do ....

1,522,668 - 715,478
= ....

To find out how many more blood cells the second sample had, we need to subtract the number of blood cells in the first sample from the number of blood cells in the second sample.

Number of blood cells in the second sample: 1,522,668
Number of blood cells in the first sample: 715,478

Second sample - First sample = 1,522,668 - 715,478 = 807,190

Therefore, the second blood sample had 807,190 more blood cells than the first sample.