Answer:
3/10
Explanation:
10 starting pancakes = 100%
the sister ate 2 pancakes - 20%
Alan ate 3 pancakes - 30%
5 pancakes left - 50%
Alan ate 3 pancakes which is 30% of them all together.
Alan ate 3/10 of the pancakes
Alans sister ate 2/10 of the pancakes