Some digits are missing from this credit card number. If the sum of any three consecutive digits is 20, what is the value of x?
_ _ _5 - _ _ _ _- x_ _ _ - _8_ _
If you consider the sequence as: a, b, c, 5, d, e, f, g, x, h, i, j, k, 8
You then set up equations like:
a+b+c = 20 ...(1)
b+c+5 = 20 .... (2)
c+5+d = 20
You then find solutions like: from eq(2)b+c+5 = 20or, b+c = 20-5 =15put this in eq (1),a+15 =20you get,
a=5 similarly, you can find,
If a = 5 and b = 8, then c = 7. Since x = c, x = 7. Please best my answer and add me as your tutor for further help. Thanks :)
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