Question

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

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Answer 1

Answer:

y=1

Explanation-As same as the rule of 3

Answer 2

think 9 multiples 21y5

divisibility rule of 9 :sum of all digits in a number if the sum of all rights is multiple of 9 then the number is divisible with nine

according to this 2+1+y+5=8+y =9 table

9×2=18 then equal to that equation 8+y=18 y=10

there your your answer is 10

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