In an examination, 8% of the students fail. What percentage of the students pass? If 1650 students appeared in the examination, how many passed?

Express the following ratios in the language of daily life: (i) In an examination, the ratio of the number of students passing the examination to the total number of students that appeared in the examination is 4:5. (ii) Water is formed by combining volumes of oxygen and hydrogen in the ratio 1:2. (iii) To dilute an acid, students were asked to mix acid and water in the ratio 2:3.

In an examination, 15% students failed and 425 students passed. Find the number of students who failed in the examination, 15% students failed and 425 students passed. Find the number of students who failed in the examination.

To pass an examinations a students has to pass in each of the 3 papers. In how many ways can a students fail in the examination?

In a test. 90% of the students passed and 4 students failed. How many students appeared for the test?

In a class, one out of every six students fails. If there are 42 students in the class, how many pass?

In a class of 85% students pass in a surprise test. What per cent of students did not pass?

There are 60 questions in a question paper. If no two students solve the same combination of questions but solve equal number of questions, then the maximum number of student who appeared in the examination, is

72% of 25 students are good at mathematics. How many are not good at it?

Out of 32 students,8 are absent from the class. What is the percentage of the students who are absent?

The probability to pass in an examination of mathematics for three students are 1/4,1/5,1/6 . Find the probability that at least two students will pass in this examination.