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'Weekly Problem 31 - 2011' printed from http://nrich.maths.org/

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(Any one of):
 
$(6729,13458)$, $(6792,13584)$ , $(6927,13854)$, $(7269,14538)$,
$(7293,14586)$ , $(7329,14658)$ , $(7692,15384)$ , $(7923,15846)$,
$(7932,15864)$ , $(9267,18534)$ , $(9273,18546)$ , $(9327,18654)$  
 
 

This problem is taken from the UKMT Mathematical Challenges.

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