The Spache Readability Formula is designed to categorize reading materials for grades 1 through 3. For a passage of text, the variables are S, the number of sentences, W, the number of words, and U, the number of unfamiliar words (words not on a specific list). The formula (as revised) for the grade level is
Grade level = 0.121(w/s)+ 0.082U + 0.659
In this exercise we consider passages having 270 words and using 8 unfamiliar words.
(b) What is the maximum possible number of sentences?