Question
$31×5$ divisible by $3$?
✓
Answer
$31\times 5$ is divisible by $3$
$\Rightarrow 3 + 1 + x + 5$ is a multiple of $3$
$\Rightarrow 9 + x = 0, 3, 6, 9,$
$\Rightarrow x = -9, -6, -3, 0, 3, 6, 9,$
Since, $x$ is a digit
$x = 0, 3, 6$ or $9$
$\Rightarrow 3 + 1 + x + 5$ is a multiple of $3$
$\Rightarrow 9 + x = 0, 3, 6, 9,$
$\Rightarrow x = -9, -6, -3, 0, 3, 6, 9,$
Since, $x$ is a digit
$x = 0, 3, 6$ or $9$
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