Answer:
1. Her sister ate more of the cake than her brother by ⅕.
⅗ - ⅖ = ⅕
2. They brought 10⅕ kg of seafoods all in all.
2⅗ kg + 4⅕ kg + 3⅖ kg = 13/5 + 21/5 + 17/5 = 51/5 or 10⅕ kg
3. She have ⅙ of her allowance to save.
⅙ + 2/6 + 2/6 = 5/6
1 - 5/6 = ⅙
