Follow the clues to find the mystery number.
What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?
A church hymn book contains 700 hymns. The numbers of the hymns are displayed by combining special small single-digit boards. What is the minimum number of small boards that is needed?
There are six numbers written in five different scripts.
Can you sort out which is which?
Write $51$ in each script.
[Thank you to the SMILE Centre for permission to use this puzzle.]