Question

There are 14 digits of credit card number to be filled. each of the below three boxes contains continuous digits of 18 as sum. given: 4th digit is 7 and 7th digit is x. then what is the value of x?

Answer 1

According to question

Fourth number = 7
7th number  = x
so the middle one is x+1
Thus
we can say that

7 + x + x+1 = 18
9 + 2x = 18
      x = 4
thus the other two numbers is 7, 4 and 5

Answer 2

Answer:

7

Step-by-step explanation:

a+b+c=18

b+c+d=18

c+d+e=18

d+e+f=18

e+f+g=18

we have to find out value of g. g=x here.

given value of 4th no. is 7 i.e. d=7

considering d=7, accordingly b and c can have combinations as shown in figure such that b+c+d =18

similarly, d+e+f=18 & e,f can be obtained similar to b,c

now for each of the values of e & f; g is always 7 as shown in the figure to maintain e+f+g=18.

Hence, x=7.

Cheers