3 x 5 is divisible by 9,

Question:

3 x 5 is divisible by 9, if the digit x is————.

Solution:

1

Since, the number 3 x 5 is divisible by 9, then the sum of its digits is also divisible by 9. i.e. 3 + x + 5 is divisible by 9.

=>x + 8 can take values 9,18, 27,…

But x is a digit of the number 3 x 5, so x = 1.

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