[SAJ]

Why is that a trick question? 1 Troy ounce of gold weighs 1.0971 oz. Avoirdupois, times 12 Troy oz./lb. = 1 Troy pound = 13.165 oz. Avoirdupois.

Pound of lead is heavier, what's the problem? (puzzled)

[Frumious Bandersnatch]

Because the answer that the test expects is that 1 lb. of gold is equal to 1 lb. of lead.  Such a question is unreasonable to ask of third graders since they don't generally teach them the difference between troy and avoirdupois measurements.  But it is especially bad since the testors themselves don't know the correct answer.

Basically if they give the right answer (as my son did in the case in question), they are marked wrong.  If they give the wrong answer, they are marked right.