Introduction:
In the given statement, "If a = 10, then a = 20," we need to determine the value of 'a'. Let's analyze the statement and understand its implications.

Understanding the statement:
The statement "If a = 10, then a = 20" is a conditional statement, where the value of 'a' is initially given as 10, and it is asserted that 'a' is also equal to 20. However, we know that in mathematics, a variable cannot have two different values at the same time. Therefore, the given statement is contradictory, and it does not hold true.

Implications:
Since the given statement is contradictory, we cannot determine the value of 'a' based on this statement alone.

Additional information:
To determine the value of 'a', we need more information or equations that can help us solve for 'a'. If there are additional equations or conditions given, we can use algebraic methods to find the value of 'a'. However, without any additional information, the value of 'a' remains unknown.

Conclusion:
In the given statement, "If a = 10, then a = 20," the value of 'a' cannot be determined as the statement itself is contradictory. Without further information or equations, it is not possible to find the value of 'a'.