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Mathematical Reasoning

In a class, 20% students read mathematics,16% read physics and 10% read both the subjects. If there are 50 students in the class, then the number of students in the class who read either mathematics or physics is

Comprehension: In a class of 25 students of Mathematics and Computer Science, 12 students have taken Mathematics. Out of this, 8 have taken Mathematics but not Computer Science. What is the number of students who have taken Computer Science but not Mathematics?

Calculate the mean of the scores of 20 students in a mathematics test

The number of students who take both the subjects mathematics and chemistry is 30. This represents 10% of the enrolment in mathematics and 12% of the enrolment in chemistry. How many students take at least one of these two subjects?

In a school 25% students are failed in Mathematics, 15% in Physics and 5% students fail in both Mathematics and Physics. A student is selected at random. (i) If he is fail in Physics, find the probability that he is fail in Mathematics. (ii) If he is fail in Mathematics, find the probability that he in fail in Physics. (iii) Find the probability that he is fail either in Mathematics or in Physics.