To find out how much deeper the hole needs to be to meet the required 24-inch depth, you can subtract the current depth (19 7/8 inches) from the required depth (24 inches).
First, convert 19 7/8 inches to a decimal for easier calculation:
19 7/8 inches = 19 + 7/8 = 19.875 inches.
Now, subtract this from 24 inches:
24 inches - 19.875 inches = 4.125 inches.
Now convert 4.125 inches back to a fraction, which is:
4.125 inches = 4 inches + 0.125 inches = 4 inches + 1/8 inch = 4 1/8 inches.
Therefore, the hole needs to be 4 1/8 inches deeper to pass inspection.