Replace y by a suitable digit so that 9y18 is divisible by 9
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9y18=9918
now,9918 is divisible by 9
now,9918 is divisible by 9
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If a number is divisible by 9 then the sum if the digits is also divisible by 9
9+y+1+8=18+y
Nearest multiple of 9 after 18 is27
Which is 18+ 9
So the only value of y is 9
9+y+1+8=18+y
Nearest multiple of 9 after 18 is27
Which is 18+ 9
So the only value of y is 9
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