Question 19
In a classroom, each student shook hands with 4 girls and 6 boys. The number of handshakes between students of the same gender was 7 more than the number between students of opposite genders. How many boys were in the classroom?
Interpretation: No student shakes their own hand, and any pair shakes hands at most once; “4 girls and 6 boys” refers to other students.
Answer format: an integer without units. Leading zeros are optional; the source uses four digit boxes.
Interpretation: No student shakes their own hand, and any pair shakes hands at most once; “4 girls and 6 boys” refers to other students.
Answer format: an integer without units. Leading zeros are optional; the source uses four digit boxes.