The product of two rational numbers is 15.

Question:

The product of two rational numbers is 15. If one of the numbers is −10, find the other.

Solution:

Let the other number be $x$.

$\therefore x \times(-10)=15$

or $x=\frac{15}{-10}=\frac{3}{-2}$

So, the other number is $\frac{-3}{2}$.

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