The 14 digits of a credit card are written in the boxes shown. If the sum of any three consecutive digits is 20, what is the value of A?

A _ 7 _ _ _ _ _ _ _ _ 7 _ 4

• 9 because
  consider the last 3 digits 7,x.4 and their sum is 20 so x=9
  now consider the 11th digit it should be 4 to let the 11th 12th and 13th to be 20 so 11th digit will be 4 and so on if we apply the logic we get
  94794794794794 shall be the credit card number
• 7 years agoHelpfull: Yes(0) No(0)