Question

Question 20

In the given question, fill in the blanks to make the statement true.

3x5 is divisible by 9, if the digit x is ___.

Answer 1

1
Since the number 3x5 is divisible by 9, then the sum of its digits is also divisible by 9.
i.e. 3 + x + 5 is divisible by 9.
$\Rightarrow$ x + 8 can take values 9, 18, 27, .....
But x is a digit of the number 3x5, so x = 1.