A recipe for macaroni and cheese calls for 18 ounces of cheddar cheese to make 32 four-ounce portions. How much would cheddar would be needed to produce 40 eight-ounce portions?

45 ounces of cheddar cheese is required to make 40 eight-ounce portions.

Explanation:

To find : Quantity of cheddar cheese required to make 40 eight-ounce portions.

Given: Quantity of cheddar cheese required to make 32 four-ounce portions. = 18 ounces

⇒  Quantity of cheddar cheese required to make 1 four-ounce portions. = ounces.

⇒  Quantity of cheddar cheese required to make 1 eight-ounce portions. = ounces.

ounces.

⇒  Quantity of cheddar cheese required to make 40 eight-ounce portions =

Hence, 45 ounces of cheddar cheese is required to make 40 eight-ounce portions.