100 - 32 - 20 - 45 + 15 + 7 + 10 - 30 = 5

2. Number of students who only learn Japanese

32 - 15 - 7 + 5 = 15

Number of students who only study French

20 - 7 - 10 + 5 = 8

Number of students who only learn English

45 - 15 - 10 + 5 = 25

The answer is not easy, please adopt it in time, thank you!