The given table shows the classification of 100 students based on the marks obtained by them in maths and science in an examination. Marks are out of 50.
| Subjects | 40 and above | 30 and above | 20 and above | 10 and above | 0 and above | 
| Maths | 8 | 28 | 63 | 84 | 100 | 
| Science | 9 | 32 | 82 | 90 | 100 | 
| Average (aggregate) | 8 | 26 | 72 | 88 | 100 | 
Find the difference between the number of students passed with 30 as cut off marks in science and those who passed with 30 as cut off marks in maths?