01 / Start with a question.
A bicycle hire company charges a fixed £5 fee plus £3 per hour. A two-hour ride costs £11. What does a five-hour ride cost?
02 / Explain the why.
The fixed fee happens once. The hourly cost changes with the length of the ride. The relationship is C = 5 + 3h. Can you explain why doubling the ride time doesn’t double the total cost?
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03 / Keep asking.
What assumption did you make? How could you test it? Can you describe your reasoning to someone who has never seen this question?
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