Total number of students in different subjects of a college and percentage of girls and boys are shown in the below table.
Girls students and boys students are NOT having multiple subjects.
| Subjects |
Number of Students |
Girls % |
Boys % |
| Mathematics | 840 | 40 | 60 |
| Chemistry | 220 | 70 | 30 |
| Physics | 450 | 30 | 70 |
| Biology | 200 | 80 | 20 |
What is the ratio of girl students of Mathematics and Chemistry to the number of boy students of Physics and Biology?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 98 : 71.
According to the given table,
Number of girl students in mathematics = 40% of 840 = 336
Number of girl students in Chemistry = 70% of 220 = 154
Total number of girl students in Mathematics and Chemistry = 336 + 154 = 490
Number of boy students in Physics = 70% of 450 = 315
Number of boy students in Biology = 20% of 200 = 40
Total number of boy students in Physics and Biology = 315 + 40 = 355
Required ratio = 490 : 355
⇒ 98 : 71