Choose two digits and arrange them to make two double-digit
numbers. Now add your double-digit numbers. Now add your single
digit numbers. Divide your double-digit answer by your single-digit
answer. Try lots of examples. What happens? Can you explain it?
A combination mechanism for a safe comprises thirty-two tumblers
numbered from one to thirty-two in such a way that the numbers in
each wheel total 132... Could you open the safe?
Not a Polite Question
Age 11 to 14 Short Challenge Level
When asked how old she was, the teacher replied:
My age in years is not prime but odd
and when reversed and added to my age
you have a perfect square.
Or you can reverse and subtract, and
again you have a perfect square.