Make a inequality

You Are reading a book with 19 chapters. How many chapters should you read each week if you want to finish the book in 5 weeks or less?

To finish in 5 weeks:

For 4 of those weeks, read 4 chapters per week. On one of the weeks read 3 chapters.

To finish in 4 weeks:

For 3 of those weeks, read 5 chapters per week. On one of the weeks read 4 chapters.

To finish in 3 weeks:

For 2 of those weeks, read 6 chapters per week. On one of the weeks read 7 chapters.

To finish in 2 weeks:

On one week read 10 chapters. On the other week read 9 chapters.

To finish in 7 days:

For 6 of those days, read 3 chapters. On one of the days, read 1 chapter.