Question
$1 x 35$ is divisible by $9$ if $x =$ _______.
✓
Answer
$1\ x \ 35$ is divisible by $9$ if $x = 0.$
Solution:
If $1\ x\ 35$ is divisible by $9,$
then the sum of its digit is also divisible by $9.$
i.e., $1 + x + 3 + 5$ is divisible by $9.$
$9 + x$ can takes values $0, 9, 18, 27$
$ 9 + x = 9$ or $18\ x = 0$ or $9$
Solution:
If $1\ x\ 35$ is divisible by $9,$
then the sum of its digit is also divisible by $9.$
i.e., $1 + x + 3 + 5$ is divisible by $9.$
$9 + x$ can takes values $0, 9, 18, 27$
$ 9 + x = 9$ or $18\ x = 0$ or $9$
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