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If the number x4738 is divisible by 9, what is the value of x?
A5
B7
C6
D4
Answer & Solution
Correct answer: A. 5
1. A number is divisible by 9 if its digit sum is divisible by 9.
2. Digit sum = x + 4 + 7 + 3 + 8 = x + 22.
3. x + 22 must be a multiple of 9; the next multiple is 27, so x = 5.
_Source: RRB Group D CEN-02/2018 PYQ, Q.39._
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