Question

X X X 7 X X X y X X X 8 X X
The fourteen digits of a credit card are to be written as shown above.
If the sum of every three consecutive digits is 18, then the value of y is :

a. 3
b. cannot be determined from the given information.
c. 2
d. 1; X X X 7 X X X y X X X 8 X X; The fourteen digits of a credit card are to be written as shown above.; If the sum of every three consecutive digits is 18, then the value of y is :; a. 3; b. cannot be determined from the given information.; c. 2; d. 1

Answer 1

Answer:3

Step-by-step explanation:

Let us assume right most two X are a , b

Then Sum of all the digits = 18 x 4 + a + b .......... (1)

Also Sum of the X before 7 = 18

Sum of the X between 7 & y = 18

and sum of the X between y & 8 = 18

So Sum of the 14 digit = 18 + 7 + 18 + y + 18 + 8 + a + b .....(2)

Equating 1 and 2 we get y = 3