Question

to win the annual read - a - thon at his school, dirk has to read more books than any of his classmates over winter break. he starts by reading a lot of sports books. then, he reads 7 mystery books. in all, dirk reads 25 books for the read - a - thon.
which equation can you use to find the number of sports books n dirk reads?
$7n = 25$ $n - 7 = 25$ $n + 7 = 25$ $\frac{n}{7}=25$
solve this equation for n to find the number of sports books dirk reads.
____ sports books
submit

Explanation:

Step1: Identify the correct equation

Dirk reads \( n \) sports books and 7 mystery books, with a total of 25 books. So the equation is \( n + 7 = 25 \).

Step2: Solve for \( n \)

Subtract 7 from both sides of \( n + 7 = 25 \):
\( n + 7 - 7 = 25 - 7 \)
\( n = 18 \)

Answer:

The correct equation is \( n + 7 = 25 \), and the number of sports books Dirk reads is 18.