Ms Wharton bought some books at a book sale including 20 paperback books 80% of all the books she bought were paperbacks

25 books.

Step-by-step explanation:

Let as consider we need to find "how many books did Mr. Wharton buy in all?"

Let total number of books bought by Mr. Wharton be x.

80% of all the books she bought were paperbacks.

It is given that the number of paperbacks is 20.

Divide both sides by 0.8.

Therefore, Ms Wharton bought 25 books in all.

5

step-by-step explanation:

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you