6. The afternoon classes in a school begin at 2:00 P.M. and end at 4:52 P.M. There are four afternoon class periods with 4 minutes between periods. The number of minutes in each class period is

7. The three volumes of Encyclopedia of Animal Kingdom sit in order on a shelf with no space between the volumes, all upright, so that their spines are visible, left to right : I, II and III. Each is 30 mm thick, comprising 24 mm of total pages and 3 mm for each cover. A bookworm bores from page 1, volume I, to the last page of volume III. How far does it travel ?

8. According to a survey at a company, 20 percent of the employees owned cell phones in 1994, and 60 percent of the employees owned cell phones in 1998. From 1994 to 1998, what was the percent increase in the fraction of employees who owned cell phones?

9. From 2018 to 2019, Mohan’s annual salary increased by 10 percent and Arun’s annual salary decreased by 5 percent. If their annual salaries were equal in 2019, then Arun’s annual salary in 2018 was what percent greater than Mohan’s annual salary in 2018 ?

10. A candidate scores 20% and fails by 45 marks and another candidate who scores 45% marks gets 30 marks more han the minimum required to pass the examination. Find the maximum marks for the examination.