Question

If 21y5is a multiple of 9,where y is a dight,what is the value of y?

Answer 1

Answer:

y = 1

Step-by-step explanation:

If 21y5 is a multiple of 9 then their sum of digits should be divisible by 9.

 ==: 2 + 1 + y + 5 = 9

 ==: y = 1

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