(Ans). (B)
(Question). The compound ratio of 2/5, 6/7, 1/3 and 1/8 is given by?
Options:
(A) 7/98
(B) 1/70
(C) 1/98
(D) 1/96
(E) 1/68
(CoT). 2/5 * 6/7 * 1/3 * 1/8 = 12/840 = 1/70

(Ans). (C)
(Question). In a question on division with zero remainder, a candidate took 12 as divisor instead of 21. The quotient obtained by him was 35. The correct quotient is:
Options:
(A) 15
(B) 18
(C) 20
(D) 22
(E) 24
(CoT). Number = (35 * 12) = 420
Correct quotient = 420/21 = 20

(Ans). (C)
(Question). A train running at the speed of 30 km/hr crosses a pole in 6 sec. What is the length of the train?
Options:
(A) 20 m
(B) 70 m
(C) 50 m
(D) Cannot be determined
(E) None of these
(CoT). Speed = 30 * 5/18 = 25/3 m/sec
Length of the train = speed * time = 25/3 * 6 = 50 m

(Ans). (A)
(Question).
A number is 101102103104...150. As 101 102 103 103.... 150. What is reminder when divided by 3?
Options:
(A) 2
(B) 5
(C) 6
(D) 7
(E) 8
(CoT). Divisibility rule for 3 also same as 9. so from the above discussion sum of the digits = 380 and remainder = 380/3 = 2.