I saw a math question on an international that confused the shit out of me because of how it was worded. The question is "The line shown models the number of cubic yards of soil, x, and mulch, y, a landscaper can purchase for $150. What is the price per cubic yard of soil?".
It's a budget constraint problem, and I missed it because of how ambiguous the question was. I'm way more used to the word "combinations" than "the number of...". I never missed a math question on a US test due to the wording.