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Of 132 examinees of a certain school,the ratio of successful to unsuccessful candidates is 9: 2.If 4 more students passed,what would have been the ratio of successful to unsuccessful students? 25:4 b.4:25 c.228:5 d.3:28

Among 132 examines of a certain school , the ratio of successful and unsuccessful students is 9:2 .Had 4 more students passed , then the ratio of successful to unsuccessful students will be :

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75% of the students passed in an examination. If 2 more students had passed the examination. 80% would have been successful. How many students are there in the class?

The number of students appeared from a school for the Madhyamik Examination in three consecutive years are in the ratio 7:8:10 and 75%, 87.5% and 93.75% of the students of respective years were successful. What is the percentage of students who were successful during these three years taken together?

The ratio of successful students to the failed students is

A student appears for tests 1, 2 and 3. The studentis successful if he passes either in tests 1 and 2 or tests 1 and 3. The probabilities of the student passing in tests 1, 2 and 3 are p, q and (1)/(2) , respectively. If the probability that the student is successful is (1)/(2) , then