Question

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Answer 1

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A number is divisible by 9 when the sum of its digit is divisible by 9

4+7+1+z+8 =20 +z

the closest multiple of 9 to 20 is 27

Therefore

20+z =27

z =27-20

z = 7

Answer 2

$answer$

Here our given number is 471Z8 ,which is divisible by 9.

We know that a number is divisible by 9 if the sum of digits is divisible by 9.

So 4+7+1+Z+8=0,9,18,.....

20+Z =multiple of 9.

Z=multiple of 9-20

The possible multiple is 27

So Z=7

Option C is the answer.