In a class, 70 students wrote two tests wiz, test-I and test-II `50%` of the students failed in test I and `40%` of the students in test -II. How many students passed in both tests?

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

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

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.

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

A student's mean score on 5 tests was 84. The student's mean score on the first 4 of these tests was 87. What was the student's score on the fifth of these tests ?

In an acoustic class, 120 students are male and 100 students are female. 25% of the male students and 20% of the female students are engineering students. 20% of the male engineering students and 25% of the female engineering students passed the final exam. What percentage of engineering students passed the exam?

A student appears for tests I, II and III. The student is successful if he passes either in tests I and II or tests I and III. The probabilities of the student passing in tests I, II, and III are, respectively, p, q, and 1/2. then p(1+q)=

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

In a class, 30% students fail in English, 20% students fail in Hindi and 10% students fail in both English and Hindi. A student is chosen at random, then what is the probability he fail in English, if he has failed in Hindi?

In a college, 70% students pass in Physics, 75% pass in Mathematics and 10% students fail in both. One student is chosen at random. What is the probability that: He passes in Mathematics given that he passes in Physics.