Follow the clues to find the mystery number.
There are exactly 3 ways to add 4 odd numbers to get 10. Find all
the ways of adding 8 odd numbers to get 20. To be sure of getting
all the solutions you will need to be systematic. What about a
total of 15 with 6 odd numbers?
Great Granddad is very proud of his telegram from the Queen
congratulating him on his hundredth birthday and he has friends who
are even older than he is... When was he born?
Four bags contain a large number of $1$s, $3$s, $5$s and $7$s.
Pick any ten numbers from the bags above so that their total is $37$.