Based on the information given, the scale that's used by Harry for drawing the schoolyard will be 1:7000.
Firstly, it should be noted that
1 meter = 1000 milliliters
Therefore, 154 meters = 154,000 millimeters
Since the schoolyard is 154 meters long in real life but is 22 millimeters long in the drawing, then the scale will be:
= 22/154000
= 1/7000
Therefore, the scale is 1:7000.
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