Digital PSAT Math Practice Question 219: Answer and Explanation

Question: 219

A typist has already typed 3,500 words of a document. How many total words, W(t), of the document will he have typed if he can type 70 words per minute and types for an additional t minutes?

• A. W(t) = 3,500t
• B. W(t) = 70t -3500
• C. W(t) = 3,500t + 70
• D. W(t) = 3,500 + 70t

Correct Answer: D

Explanation:

(D) The typist has already typed 3500 words, so this will be a constant in the expression. The typist types 70 words per minute, so if he types for t minutes, he will type 70t more words. Therefore, the total number of words typed, W(t), will be given by the expression

W(t) = 3500 + 70t, choice (D).