Correct Answer - Option 3 : 130
Given:
The number of boys who donated blood in department C = 39
The number of girls who donated blood in department C = 70%
Calculations:
Department |
percentage of girls |
percentage of blood donating girls* |
number of blood donating Boys* |
percentage of blood donating boys |
number of blood donating girls |
A |
25% |
40% |
48 |
60% |
32 |
B |
40% |
50% |
75 |
50% |
75 |
C |
30% |
70% |
39 |
30% |
91 |
30% of department C = 39
Total number of students in department C = 39 × 100/30
⇒ 130
∴ The number of students who donated blood in the department C is 130