Sea and Forest Paintings

Difficulty: Medium · Topics: Discrete Mathematics, Sets, Word Problems

A painter who paints only pictures about the sea or the forest painted 10 pictures in 2021 and 12 pictures in 2022. In 15 of the pictures painted in these two years there is a forest.

Every picture with a sea that was painted in 2021 contains a forest as well, and none of the pictures painted in 2022 uses the sea and the forest together.

In how many of the pictures painted in 2022 is there a sea?