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46. To complete a work A and B takes 8 days, B and C takes 12 days, A,B and C takes 6 days. How much time A and C will take
A.24 days
B.16 days
C.12 days
D.8 days
Ans. D
47. In a group of 8 boys, 2 men aged at 21 and 23 were replaced, two new boys. Due to this the average cost of the group increased by 2 years. What is the average age of the 2 new boys?
A. 17
B. 28
C. 23
D. 30
Ans. D
48. Two trains, each 100 m long are moving in opposite directions. They cross each other in 8 seconds. If one is moving twice as fast the other, the speed of the faster train is
A. 75 km/hr
B. 60 km/hr
C. 35 km/hr
D. 70 km/hr
Ans. B
49. One year ago the ratio between Rahul salary and Rohit salary is 4:5. The ratio between their individual salary of the last year and the current year is 2:3 and 3:5 respectively. If the total current salary of Rahul and Rohit is 4300. Then find the current salary of Rahul.
A. 1200
B. 1800
C. 1600
D. 2000
Ans. B
50. The probability of occurrence of event X is 0.8 and that of event Y is 0.05. The events are mutually exclusive. What is the probability of occurrence of either X or Y ?
A) 0.85
B) 0.75
C) 0
D) Can’t be determined
Ans. A
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