A PUZZLE IN REVERSALS

Most people know that if you take any sum of money in pounds, shillings, and pence, in which the number of pounds (less than £`12`) exceeds that of the pence, reverse it (calling the pounds pence and the pence pounds), find the difference, then reverse and add this difference, the result is always £`12, 18`s. `11`d. But if we omit the condition, "less than £`12`," and allow nought to represent shillings or pence—(`1`) What is the lowest amount to which the rule will not apply? (`2`) What is the highest amount to which it will apply? Of course, when reversing such a sum as £`14, 15`s. `3`d. it may be written £`3, 16`s. `2`d., which is the same as £`3, 15`s. `14`d.