Answer:
9/16
Step-by-step explanation:
If Denise ad her brother painted 3/4 of her living room and she painted 3/4 of that part, it means she painted
= (3/4) × (3/4)
= 9/16 part of the living room
Her brother would have painted
(3/4) - (9/16) = 3/16 part of the living room