1...150 workers were engaged to finish a piece of work in
certain number of days. four workers dropped the second day,
four more workers dropped the third day and so on. It takes
8 more days to finish the work now. Find the member of days
in which the work was completed.
2...two cars start together in the same direction from the same
place. The first goes with uniform speed of 10 km /hr. The second
goes at the speed of 8 km/h in the first hour and increases the
Speed by 1/2 km in each succeeding hour. After how many
hours will the second car overtake the first car if both
cars go non-Stop?

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?