#12 What was the original depth of the water in the larger vase?

#10 What Is g(x)?

#9 A Rectangular Challenge

#7 Which One Is The Correct Graph?

#3 What Is the Area on the xy-plane?

#1 Which Diagram Could Be the Right Sketch?

Grid Walking Challenge

Get This Right If You Want To Study At Cambridge University

British Maths Olympiad Round 1 From 2009

What’s the Height of the Red Bar?

What Does x¹⁰⁰ + y¹⁰⁰ = 1 Look Like?

A Very Very Tricky Oxford University Maths Question