Spacing is the amount of space above and below a paragraph.

Paragraph Spacing 

When using any word processing software, for example, such as word, you can change the paragraph spacing to separate your paragraphs more than the lines of the paragraph, allowing you to distinguish them better and read them easier.

The amount of vertical space between lines of text in a paragraph. ... the amount of space above and below a paragraph. I hope this helps

You just need to divide 120 into 5 and you get 24 groups. Hoped it helped:)