Class 12 students scoring (i) 95% and above (total 6000) and (ii) 90–95% (total 10000) from six Delhi schools A–F, with Girls:Boys ratio.
| School | 95%+ (%) | Girls:Boys |
|---|---|---|
| A | 13% | 11:5 |
| B | 18% | 5:7 |
| C | 17% | 3:5 |
| D | 8% | 7:1 |
| E | 24% | 5:4 |
| F | 20% | 5:3 |
| School | 90–95% (%) | Girls:Boys |
|---|---|---|
| A | 16% | 3:2 |
| B | 6% | 1:4 |
| C | 10% | 5:3 |
| D | 28% | 2:3 |
| E | 21% | 9:5 |
| F | 19% | 3:4 |
The average number of boys who scored between 90-95% marks from the schools A to E together is:
A746
B718
C745
D785 ✓ Correct
Correct answer: (D) 785
Explanation
The average number of such boys from schools A to E is 785.
Boys of A scoring 90-95% are 16 percent of 10000 times 2 over 5, that is 640.
Boys of B are 6 percent times 4 over 5, that is 480, and boys of C are 10 percent times 3 over 8, that is 375.
Boys of D are 28 percent times 3 over 5, that is 1680.
Boys of E are 21 percent times 5 over 14, that is 750.
The sum 3925 divided by 5 schools gives the average 785.
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