Question

the hardcover version of a book weighs 7 ounces while its paperback version weighs 5 ounces. forty - five copies of the book weigh a total of 249 ounces.

weight of books	number of books	weight per book (ounces)	total weight (ounces)
paperback	$45 - h$	5	$x$
total	45		249

which value could replace $x$ in the table?

• $40 - h$
• $50 - h$
• $5(45)-h$
• $5(45 - h)$

Explanation:

Step1: Recall total weight formula

Total weight = Number of books × Weight per book.

Step2: Apply formula to paperback

For paperback, number of books is \( 45 - h \), weight per book is 5. So total weight \( x = 5\times(45 - h) \).

Answer:

\( 5(45 - h) \) (the last option among the given choices)