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If 21 y5 is a multiple of 9, where y i...

If ` 21 y5` is a multiple of 9, where y is a digit what is the value of `y` ?

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For a number to be a multiple of `9`, sum of all of its digits should be divisible by `9`.
Sum of digits of gfiven number `= 2+1+y+5 = 8+y`
So, `(8+y)` should be divisible by `9` if value of `y` is `1`.
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