By what rational number should $- 3$ is divided to get $- 9 / 13$ ?

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Solution

The required number can be calculated as follows:
$- 3 \div - 9 / 13$
$= - 3 \times 13 / - 9$
We get,
$= - 13 / - 3$
$= {- 3 \times (- 1)} / {- 3 \times (- 1)}$
$= 13 / 3$
$= 4 \frac{1}{3}$
Therefore, the required number is
$4 \frac{1}{3}$ .

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