Find the value of z for which the number 471z8 is divisible by 9.Also , find the number.
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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
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