There is a 14-digit credit card number in which every 3 consecutive digits add to 20. Here is a part of it. Find the value of 'x'? _ _ _ 9 _ _ _ x _ _ _ 7 _ _

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pkaneria

  • Mar 23rd, 2006
 

if we use the equation d9+d10+d11=20 and d10+d11+7=20 (d12 is 7), we get d9=7.

use 9+d5+d6=20 and d5+d6+d7=20 to get d7=9

then we have d8=20-d7-d9 = 20 - 9 - 7 = 4.

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