Question

If 21y7 is divisible by 9, then which digit can replace the letter y in the four digit number 21y7?

Answer 1

Answer:

If 21y5 is a multiple of 9, than

2+1+y+5 is also a multiple of 9

8+y is a multiple of 9

Than y=1 because y is a single digit number.

Step-by-step explanation:

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