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Question
3 × 5 is divisible by 9 if the digit x is ______.
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Solution
3 × 5 is divisible by 9 if the digit x is 1.
Explanation:
Since, the number 3 × 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 × 5, so x = 1.
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