3. a school cafeteria makes cheese sauce for macaroni using 15 cups of
swiss cheese and 17 cups of cheddar cheese. perry tries to make the
sauce for a family party using 5 cups of swiss and 7 cups of cheddar.
is perry using the correct ratio? explain.

46

Step-by-step explanation:

If you take the fraction and divide it 2/11, it'll give you the decimal form of what you need, which will give you .18

Now your equation has become 254*.18, which you multiply instead of divide because you switched the form it is given in, and if you try to divide it will give you some obscure number.

Your answer from 254*.18 is 45.72, which you cant give .72 of a book, therefore you round up, making it so he has donated 46 books.