Answer:
Jill gave 11 1/4 brownies away.
Explanation:
The first step is to determine how many brownies Jill had.
She had 3 pans of 10 brownies each.
3*10 = 30
Jill has 30 brownies.
She gives 3/8 of them away
30 * 3/8 = 90/8 =11 2/8 = 11 1/4 brownies are given away
Jill gave 11 1/4 brownies away.