Question

if 21 y 5 is a mutliple of 9 . where y is a digit. what is the value of y?
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Answer 1

Answer:

1

Step-by-step explanation:

The divisibility test for  9  states that, “A number is divisible by  9  if and only if the sum of its digits is a multiple of  9 "

That is, if the sum of the digits of a number is  9,18,27  etc., then only the number is divisible by  9  

The number given is  21y5  

So, first we will check whether the sum can be  9  

2+1+y+5=9  

8+y=9  

y=1  

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