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- Question
What is the unit digit of (217)413 × (819)547 × (414)624 × (342)812?
Options- A. 2
- B. 4
- C. 6
- D. 8
- Correct Answer
- 8
- 1. How many 100 digit positive number are there?
Options- A. 9 × 1099
- B. 9 × 10100
- C. 10100
- D. 11 × 1098 Discuss
- 2. What is the unit digit of the sum of first 111 whole numbers?
Options- A. 4
- B. 6
- C. 5
- D. 0 Discuss
- 3. Convert decimal number 101 to binary.
Options- A. 1100101
- B. 1100111
- C. 1101001
- D. 1101011 Discuss
- 4. The first and last terms of an arithmetic progression are 23 and 42. What is the sum of the series if it has 14 terms?
Options- A. 91
- B. -133
- C. 93
- D. 133 Discuss
- 5. The reciprocal of the sum of the reciprocals of 8/7 and 5/6 is:
Options- A. 83/40
- B. 42/83
- C. 83/42
- D. 40/83 Discuss
- 6. A man sitting in a train which is traveling at 50 kmph observes that a goods train, traveling in opposite direction, takes 9 seconds to pass him. If the goods train is 280 m long, find its speed.?
Options- A. 60
- B. 62
- C. 64
- D. 65 Discuss
- 7. A train of length 110 meter is running at a speed of 60 kmph. In what time, it will pass a man who is running at 6 kmph in the direction opposite to that in which the train is going?
Options- A. 10
- B. 8
- C. 6
- D. 4 Discuss
- 8. Two trains started at the same time, one from A to B and the other from B to A . If they arrived at B and A respectively 4 hours and 9 hours after they passed each other the ratio of the speeds of the two trains was
Options- A. 2:1
- B. 3:2
- C. 4:3
- D. 5:4 Discuss
- 9. A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is :
Options- A. 9.5 km/hr
- B. 10 km/hr
- C. 10.5 km/hr
- D. 11 km/hr Discuss
- 10. Two cogged wheels of which one has 32 cogs and other 54 cogs, work into each other. If the latter turns 80 times in three quarters of a minute, how often does the other turn in 8 seconds?
Options- A. 48
- B. 24
- C. 38
- D. 36 Discuss
Problems on Numbers
Search Results
Correct Answer: 9 × 1099
Correct Answer: 5
Correct Answer: 1100101
Correct Answer: -133
Correct Answer: 40/83
Correct Answer: 62
Explanation:
Relative speed =280/9 m / sec = (280/9*18/5) kmph = 112 kmph.
Speed of goods train = (112 - 50) kmph = 62 kmph.
Correct Answer: 6
Correct Answer: 3:2
Explanation:
Note : If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then: (A's speed) : (B's speed) = (b : a)
Therefore, Ratio of the speeds of two trains = = 3 : 2
Correct Answer: 10 km/hr
Explanation:
Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.
Therefore, Man's rate against the current = (12.5 - 2.5) = 10 km/hr.
Correct Answer: 24
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