Author note — to cover

Cover workers and time, taps filling tanks, speed and journey time, and supplies lasting fewer days, all solved via the fixed product such as total worker-hours, including non-integer answers and whole-worker sense checks. Recognising which model applies is the sibling page; algebraic k/x equations are Higher only. Both tiers. (R10)

• Fluency — direct questions on inverse proportion problems, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).