Let's start by finding the number of blue, red, and white blouses:
Number of blue blouses = 20% of 30 = 0.2 x 30 = 6
Number of red blouses = 5
Number of white blouses = 30% of 30 = 0.3 x 30 = 9
Now we can find the total number of blue, red, and white blouses:
Total number of blue, red, and white blouses = 6 + 5 + 9 = 20
Finally, we can find the number of pink blouses by subtracting the total number of blue, red, and white blouses from the total number of blouses:
Number of pink blouses = Total number of blouses - Total number of blue, red, and white blouses
Number of pink blouses = 30 - 20
Number of pink blouses = 10
Therefore, Kelsey has 10 pink blouses.