Answer:
Kate had 7/20 of brownies left
Step-by-step explanation:
Let 'p' stand for the pan of brownies.
Since, she made a pan of Brownies; P = 1
She gave 1/4 to Maggie and 2/5 left over to Scott.
Therefore, this implies she has 1 - (1/4 +2/5) left
1 - 13/20
= 7/20
Kate had 7/20 of brownies left