Math, asked by sherynwilliam12, 15 hours ago

If 31y3 is a multiple of 9, where y is a digit, what is the value of y?​

Answers

Answered by midhunrnair04
0

Answer:

9

please make me brainleist

Answered by ishanithakur44
1

Answer:

We know that, according to divisibility rules, if the sum of all the digits of a number is equal to 9 or its multiples, then the number is a multiple of 9.

If a number is a multiple of 9, then the sum of its digits will be divisible by 9.

Sum of digits of 21y5 = 2 + 1+ y + 5 = 8 + y

Hence, 8 + y should be a multiple of 9.

This is possible when 8 + y is any one of these numbers 0, 9, 18, 27, and so on ...

However, since y is a single-digit number, this sum can be 9 only.

8 + y = 9

y = 9 - 8

y = 1

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