All you have to do is to deduct 250 from the result given, and the three
figures in the answer will be the three points thrown with the dice.
Thus, in the throw we gave, the number given would be 386; and when we
deduct 250 we get 136, from which we know that the throws were 1, 3, and
6.
The process merely consists in giving 100a + 10b + c + 250, where a, b,
and c represent the three throws. The result is obvious.