Question 15
David noted down all the traffic signs that he sees on his left-hand side along the way from school to home. How many triangular sign(s) has he noted?
Editorial source-language correction: the original Vietnamese statement says “right-hand side”, while the English statement and the supplied worked solution use left. This practice question is graded using the English left-hand interpretation. The literal Vietnamese reading is discussed separately in the solution.

Editorial source-language correction: the original Vietnamese statement says “right-hand side”, while the English statement and the supplied worked solution use left. This practice question is graded using the English left-hand interpretation. The literal Vietnamese reading is discussed separately in the solution.
