For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. what is the sum all of the even integers between 99 and 301?
A 10100
B 20200
C 22650
D 40200
E 45150 答案 B
GWD2 (18)
On a certain transatlantic crossing, 20percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?
A 33 1/3%
B 40%
C 50%
D 60%
E 66 2/3% 答案 C
GWD3 (14)
How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1mile=1160 yards)
A 8
B 9
C 10
D 11
E 12 答案 C 这道题算了好多次 为什么都是1.5？
GWD5 (19)
In a survey of 200 college graduates, 30 percent said they had received student loans during their college careers, and 40 percent said they had received scholarships. What percent of those surveyed said that they had received neither student loans nor scholarships during their college careers?
(1) 25 percent of those surveyed said that they had received scholarship but no loans
(2) 50 percent of those surveyed who said that they had received loans said that they had received scholarships
