I think it works like this, although it's been a long time since HS physics.
Put one end of the board on your scale, the other end pivots.
Measure the length from the pivot end of the board to the scale.
Place the tongue somewhere in between the pivot end and the scale.
Measure the length from the pivot end to the tongue.
Weight the tongue.
Actual_Tongue_Weight = Measured_Tongue_Weight * Length_of_Board / Distance_from Pivot_to_Tongue
Somebody should double check this ...
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