Answer:
She can trim 19 sweaters.
Explanation:
Kayla has a particular pattern in which she needs 3 ounces of white yarn.
That is in order to make a sweater of that particular pattern she requires white wool = 3 ounces
Kayla has total white wool = 57 ounces
one sweater requires = 3 ounces
number of sweater =

=

She can trim 19 sweaters with the Yarn she has on hand