How many girls are there out of these 7 students ?
2025
How many girls are there out of these 7 students ?
- A.
3
- B.
3 OR 4
- C.
4
- D.
Data inadequate
Attempted by 28 students.
Show answer & explanation
Correct answer: A
Concept: In a diagram-based seating puzzle, the shape drawn at each labelled seat directly encodes the attribute stated in the legend. Reading the diagram against its legend is enough to answer any count question about the arrangement -- no further deduction is required once the diagram itself is given.
Application: The legend fixes the reading rule: a square marks a Boy and a circle marks a Girl.
Bench | Boys (square) | Girls (circle) |
|---|---|---|
Bench I | A, E | D |
Bench II | F | B |
Bench III | G | C |
This accounts for all seven labelled seats -- A, B, C, D, E, F and G -- matching the "7 students" in the question. The circle-marked seats are B, D and C, so there are exactly 3 girls; the square-marked seats are A, E, F and G, so there are 4 boys.
Cross-check: 3 girls + 4 boys = 7, matching the total given in the question -- confirming every seat is accounted for, so the count is exact and complete, leaving no room for an "either/or" range or a claim that the data is insufficient.
Result: The number of girls is exactly 3.