Riddle

What did one math book say to another?

Choose an answer

A.You're my favorite subject!
B.Let's add up!
C.I feel divided.
D.I have so many problems.
Hint: It's a 5-word phrase with 19 letters, starting with "I".

Answer

I have so many problems.

Why this is the answer

This is a pun: math books are literally full of practice 'problems,' which doubles as an emotional complaint between two books.

This riddle is filed under How, What, Why Riddles and rated Easy.