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In two successive years, 80 and 60 students of a school appeared at the final examination of which 60% and 80% passed respectively. The average rate of students passed (in percent) is
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- 68%
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68 4 % 7 - 70%
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72 3 % 7
Correct Option: B
Total examiners = 80 + 60 = 140
Total successful examiners
| = | + | 100 | 100 |
= 48 + 48 = 96.
∴ Required percent
| = | × 100 | 140 |
| = | = 68 | % | 7 | 7 |
Aliter : Using Rule 25,
Let us take B = 80, G = 60 and b = 60%, g = 80%
∴ Percentage of passed candidates
| = |  |  | % | B + G |
| = | | | % | 80 + 60 |
| = | 140 |
| = | = 68 | % | 7 | 7 |
