Ara sells 1/2 of her apples in the morning, so she sells 35.5 / 2 = 17.75 pounds of apples.
She sells 4/19 of the remaining apples in the afternoon, so she sells 17.75 * 4/19 = 2.7 pounds of apples.
She sells 1/4 of the remaining apples in the evening, so she sells (35.5 - 17.75 - 2.7) / 4 = 4.5 pounds of apples.
Ara has 35.5 - 17.75 - 2.7 - 4.5 = 10.5 pounds of apples left