Always equal

Ankit loves math. Recently he has been introduced to equations and enjoys questions such as X * 4 =24.

Ankit also has a friend Parth so does not love math as much. Ankit and Parth have been asked to sit down to study. Parth's dad gives both some problems to work on. Parth is asked "What is 16+8". And then Ankit is asked "what is x when x + 16 = 20".

Before Ankit can think of the answer there is a scream from Parth. “That’s not fair. You gave him the answer !!!”