Answer:
15,441,524,141,524,115,374,747,475,242,497,297,539,801,907,864,649,469,579,152,621,379,712,290,971,009,517,541,636,763,930,502,308,064,183,334,245 apples left.
Explanation:
Subtract how many apples he gave his sister from his original amount.
Hope this helps!