If it costs 2.55 dollars to rent 3 books at the library, how much would cost to rent 51 books?
3 books = $2.55
51 books = x $
(3 books / $2.55) = (51 books / x)
then solve for x (aka cross multiply and divide)
To find out how much it would cost to rent 51 books, we can set up a proportion using the given information.
We know that the cost of renting 3 books is $2.55. Let's label this as the first ratio:
3 books / $2.55
To find the cost of 51 books, we set up the same ratio:
51 books / x
Now we just need to set up a proportion:
3 / $2.55 = 51 / x
To solve this proportion, we can use cross multiplication:
3x = 51 * $2.55
Now, we multiply 51 by $2.55:
3x = $130.05
To isolate x, the unknown value representing the cost of renting 51 books, we divide both sides of the equation by 3:
x = $130.05 / 3
Evaluating this expression, we can find the cost of renting 51 books:
x ≈ $43.35
Therefore, it would cost approximately $43.35 to rent 51 books at the library.