Answer:
Frida will keep 3 apples for herself.
Explanation:
Given:
Number of red apples = 15
Number of green apples = 12
So
Total number of apples Frida have =

Number of people to distribute (equally) upon =

Multiples of
=

Closest number to
is
.
Now number of apples Frida will keep for herself =(Total number of apples) - (Apples distributes among
people equally.)
⇒

So our final answer is 3.