Franco reads $\frac{1}{2}$ of a chapter every night. The book has 15 chapters. We want to find how many days it will take Franco to finish the book.

1. Problem Description

Franco reads $\frac{1}{2}$ of a chapter every night. The book has 15 chapters. We want to find how many days it will take Franco to finish the book.

2. Solution Steps

Let $x$ be the number of days it takes Franco to finish the book.

Since Franco reads $\frac{1}{2}$ of a chapter per day, in $x$ days he will read $\frac{1}{2}x$ chapters.

Since the book has 15 chapters, we can write the equation:

$\frac{1}{2}x = 15$

To solve for $x$, we multiply both sides of the equation by 2:

$2 \times \frac{1}{2}x = 2 \times 15$

$x = 30$

3. Final Answer

It will take Franco 30 days to finish the book.