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'Saturn' chocolate bars are packed in boxes of either 5 or 12.
What is the smallest number of full boxes required to pack exactly 2005 'Saturn' bars?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
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Age 14 to 16
ShortChallenge Level 
'Saturn' chocolate bars are packed in boxes of either 5 or 12.
What is the smallest number of full boxes required to pack exactly 2005 'Saturn' bars?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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Take any pair of two digit numbers x=ab and y=cd where, without loss of generality, ab > cd . Form two 4 digit numbers r=abcd and s=cdab and calculate: {r^2 - s^2} /{x^2 - y^2}.
