There are 37 students in a class a year, 25 learn calligraphy and 2 1 learn painting. How many students study both?

You can look at it this way: to participate in the competition+not to participate in the competition = the number of fifth graders.

Only 27 people took part in the calligraphy competition.

There are 15 people participating in the painting competition.

There are 10 people all involved.

So the number of people participating in the competition is 52.

Number of fifth-grade students 84