This is the boss. No calculator — the numbers are 3-4-5 clean and the inspector’s card carries the one tangent fact you’ll need. One loading-dock ramp, and every answer feeds the next: the slope length by Pythagoras, then the grade from rise over level run, then the angle off the card, then the verdict against the code. Write each line down — one early slip rolls downhill, and rolling downhill is the one thing ramps do best.

Everything from the chapter rides on this one. 5★ under par here takes the chapter crown. Clipboard out.