Ques: A train 150 meters long completely crosses a 240 meters long bridge in 42 seconds. What is the speed of the train is?
Options:
(A) 32
(B) 33
(C) 88
(D) 66
(E) 09
Ans: (B)
CoT: S = (150 + 240)/42 = 390/42 * 18/5 = 33

Ques: The average of seven numbers is 18. The average of first three numbers is 14 and the average of last three numbers is 19. What is the middle number?
Options:
(A) 25
(B) 27
(C) 29
(D) 32
(E) 34
Ans: (B)
CoT: The total of seven numbers = 7X18 = 126
The total of first 3 and last 3 numbers is = 3 X 14+3 X 19 = 99
So, the middle number is (126 - 99 ) = 27

Ques: John makes $60 a week from his job. He earns a raise andnow makes $78 a week. What is the % increase?
Options:
(A) 16.12%
(B) 16.66%
(C) 30%
(D) 17.66%
(E) 18.1%
Ans: (C)
CoT: Increase = (18/60)*100 = (3/10)*100 = 30%.

Ques: he population of a city is 160,000. If it increases at the rate of 6% per annum, then what will be its population 2 years hence?
Options:
(A) 1797787
(B) 1797723
(C) 179776
(D) 179728
(E) 179718
Ans: (C)

CoT: Population after n years = P [1 + (R/100)]2
Population after 2 years = 160000 * [1 + 6/100]2 = (160000 x 53/50 x 53/50) = 179776