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Double Time
Age 16 to 18
Challenge Level 
Take each pair. Apply the decoding formulae. You will need to find the equivalent of 1/5, that is the multiplicative inverse of 5 modulo 26 (the number by which 5 is multiplied to give 1 modulo 26). Finally arrange the 44 letters into words putting the gaps in the appropriate places.
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Old Nuts
In turn 4 people throw away three nuts from a pile and hide a quarter of the remainder finally leaving a multiple of 4 nuts. How many nuts were at the start?
