ANSWER
3 rotten apples
Step-by-step explanation
We know that Amber and Jacob have the same fraction of rotten apples in their bags.
Jacob's bag has 4 apples in total, of which 1 is rotten. Thus, the fraction of rotten apples he has is,
Amber has the same fraction in her bag, but she has a total of 4 apples. If n is the number of rotten apples in Amber's bag,
We have to find n so that n/12 equals 1/4.
Multiply both sides by 12,
So, Amber's bag has exactly 3 rotten apples