" 1.In a test in Mathematics,"20%" of the "

In a test in Mathematics, 20% of the students obtained ''first class''. If the data are represented by a Pie - chart, what is the central angle corresponding to ''first class''?

In a class 30% of the student fail in Mathematics, 20% of the student fail in English and 10% fail in both.If he has failed in English, what is the probability thet he has failed in Mathematics?

In a class 30% of the student fail in Mathematics, 20% of the student fail in English and 10% fail in bothIf he has failed in Mathematics, what is the probability that he has failed in English

In a class 30% of the student fail in Mathematics, 20% of the student fail in English and 10% fail in both. A student is selected at random.

In a class 30% of the student fail in Mathematics, 20% of the student fail in English and 10% fail in both.What is the probability that he has failed in both ?

In an examination, 25% students failed in Mathematics, 20% failed in Economics and 5% failed in both. Find the percentage of students who passed in both the subjects.