Question

What is the missing value in the table below?

Number of Books
3. $10.00
9. $30.00
18. $60.00
$80.00

Answer 1

24 books

Explanation:

Books are valued at $10/3 books. 18 books would have a value of (18books)*($10/3books) = $60, and so on.

X books would have a value of X($10/3)=$80

X = ($80)*(3/$10)

X = 24 books