In an examination, `40%` of candidates got second class. When the data are represented by a pie chart, what is the angle corresponding to second class?

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''?

The numbers of Science, Arts and Commerce graduates working in a company are 30, 70 and 50 respectively. If these 'figures are represented by a pie chart, then what by a pie chart, then what is the angle corresponding to Science graduates ?

In an examination, 40% of the candidates wrote their answers in Hindi and the others is English. The average marks of the candidates written in Hindi is 74 and the average marks of the candidates written in English is 77. What is the average marks of all the candidates?