Here, the variable is the number of watches.
The profit on each watch it sells is, $25.
The least profit to be made is, $375.
Let x be the number of watches, Then we have, the total profit as,
[tex]25x[/tex]This profit should be atleast 375, therefore, we have,
[tex]\begin{gathered} 25x\ge375 \\ \frac{25x}{25}\ge\frac{375}{25} \\ x\ge15 \end{gathered}[/tex]