To find the missing digit in the given equation XV - ___ = Xa, we need to understand the Roman numeral system and apply the rules to solve the problem.

Roman Numeral System:
The Roman numeral system is an ancient numeral system that uses specific letters to represent numbers. Here are the basic Roman numerals and their corresponding values:

- I = 1
- V = 5
- X = 10
- L = 50
- C = 100
- D = 500
- M = 1000

Understanding the Given Equation:
The equation given is XV - ___ = Xa. We need to find the missing digit represented by the blank space.

- XV represents 15 in the Roman numeral system.
- Xa represents a number where 'X' is in the tens place and 'a' is in the units place.

Solving the Equation:
To solve the equation, we need to subtract XV from Xa.

- XV = 15
- Xa - 15 = 0 (as XV subtracted from Xa should be equal to zero)

We can rewrite Xa as 10 + a, where 'a' represents the unknown digit.

So, the equation becomes:
10 + a - 15 = 0

By rearranging the equation, we have:
a - 5 = 0

Adding 5 to both sides of the equation, we get:
a = 5

Therefore, the missing digit in the given equation is 5.

Answer:
The correct answer is option 'A'. The missing digit in the equation XV - ___ = Xa is 5.

A L