Read and answer the questions.

Hello! I am Jerry. I am 13 years old. I live a country house. There are 4 people in my family: my father, my mother, my elder sister and I. My father is 42 years old and he is an engineer. My mother is 40 years old. She is a farmer. My sister is seventeen. She is a student. And I am a student in grade 6 in Newton secondary school. My school is small but it is very nice. There are 23 students in my classroom: 15 boys and 8 girls. Every day I get up at six o’clock. Then I go to school at seven o’clock.

How many students are there in his classroom?