Answer:
Sophia's paint is lighter.
Explanation:
percent = part/whole × 100%
Sophia:
3 cups black, 4 cups white
total: 7 cups
white percent = 4/7 × 100% = 57%
Jeriel:
9 cups black, 10 cups white
total: 19 cups
white percent = 10/19 × 100% = 53%
Sophia's paint is lighter.