In an examination a student attempted 20 questions correctly and secured 60 marks. If there were two types of questions (1 marks and 5 marks questions), how many questions of 1 marks did he attempt correctly?
1
5
2
10
3
20
4
40
In an examination a student attempted 20 questions correctly and secured 60 marks. If there were two types of questions (1 marks and 5 marks questions), how many questions of 1 marks did he attempt correctly?