PunMaths book problems
Sums to solve / troubles that make you unhappy.
Why was the maths book sad? It had too many problems.
Remember: A maths book is full of 'problems' (sums), and a sad person has 'problems' (worries). One word, two meanings: that's a pun.
Short lessonWord playWriters play with words by joining opposites or by giving one word two meanings at once.