There is 1/4 ounce of yeast in every 2 1/4 teaspoons of yeast. A recipe for bread calls for 2 teaspoons of yeast. How many ounces of yeast are needed for this recipe?

Question

Please explain I don’t understand.

Answer 1

1/4 in proportion to 2 and 1/4

as

? in proportion to 2

the ratio is the same as:

1/4 in proportion to 9/4

as

? in proportion to 2

cross multiplies:

(1/4)*2 = (9/4)*?

2/4 = (9/4) * ?

2 = 9 * ?

2/9 = ?

so 2/9 ounces are needed