Number, Ranking and Time Sequence Test Questions and Answers

Q: Sangeeta remembers that her father’s birthday was certainly after eighth but before thirteenth of December. Her sister Natasha remembers that their father’s birthday was definitely after ninth but before fourteenth of December. On which date of December was their father’s birthday?

Correct answer: Data inadequateSangeeta allows the 9th to the 12th and Natasha the 10th to the 13th. Three dates - the 10th, 11th and 12th - satisfy both, so the birthday cannot be pinned down: the data are inadequate.

Q: How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?

Correct answer: ThreeWriting 421579368 in ascending order gives 123456789, and comparing the two, three pairs of digits keep the same number of digits between them in both arrangements. So the answer is three.

Q: How many 4's are there preceded by 7 but not followed by 3? 5 9 3 2 1 7 4 2 6 9 7 4 6 1 3 2 8 7 4 1 3 8 3 2 5 6 7 4 3 9 5 8 2 0 1 8 7 4 6 3

Correct answer: FourFour 4s have a 7 before them and something other than 3 after them: 7 4 2, 7 4 6, 7 4 1 and the last 7 4 6. The 4 in 7 4 3 is ruled out by the 3 that follows it. So the answer is four.

Q: In a row of boys, If A who is 10th from the left and B who is 9th from the right interchange their positions, A becomes 15th from the left. How many boys are there in the row ?

Correct answer: 23After the exchange A stands where B stood, and A is then 15th from the left - so B was 15th from the left. B is also 9th from the right, so the row holds \[ 15 + 9 - 1 = \mathbf{23} \] boys.

Q: Sam ranked 9th from the top and 38th from the bottom in a class. How many students are there in the class ?

Correct answer: 46Sam is counted from both ends, so the class holds \[ 9 + 38 - 1 = \mathbf{46} \] students.

Q: Nitin ranks 18th in a class of 49 students. What is rank from the last ?

Correct answer: 32In a class of 49, a rank of 18 from the top is \[ 49 - 18 + 1 = \mathbf{32} \] from the last.

Q: How many such digits are there in the number 7346285 which are as far away from the beginning of the number, as they will be when arranged in ascending order within the number?

Correct answer: TwoArranged in ascending order the digits of 7346285 run 2, 3, 4, 5, 6, 7, 8. Comparing position by position, only 3 (second in both) and 4 (third in both) keep their places - so the answer is two.

Q: Three persons A, B and C are standing in a queue. There are five persons between A and B and eight persons between B and C. If there be three persons ahead of C and 21 persons behind A, what could be the minimum number of persons in the queue?

Correct answer: 28Three people stand ahead of C, so C is 4th. Eight people separate B from C, putting B at the 13th place, and five separate A from B, with A ahead of B at the 7th place. Twenty-one people stand behind A, so the queue holds \[ 7 + 21 = \mathbf{28} \]

Q: In a queue, Amrita is 10th from the front while Mukul is 25th from behind and Mamta is just in the middle of the two. If there be 50 persons in the queue. What position does Mamta occupy from the front ?

Correct answer: 18thMukul is 25th from behind in a queue of 50, so he is \( 50-25+1 = 26 \)th from the front. Mamta stands midway between the 10th and the 26th place: \[ \frac{10+26}{2} = \mathbf{18} \text{th} \]

Q: A class of boys stands in a single line, One boy is 19th in order from both the ends, How many boys are there in the class ?

Correct answer: 37The boy is counted from both ends, so the class holds \[ 19 + 19 - 1 = \mathbf{37} \] boys.

Important Instructions

81.

Sangeeta remembers that her father’s birthday was certainly after eighth but before thirteenth of December. Her sister Natasha remembers that their father’s birthday was definitely after ninth but before fourteenth of December. On which date of December was their father’s birthday?

A.10th
B.11th
C.12th
D.Data inadequate

Answer: D

Correct answer: Data inadequate

Sangeeta allows the 9th to the 12th and Natasha the 10th to the 13th. Three dates - the 10th, 11th and 12th - satisfy both, so the birthday cannot be pinned down: the data are inadequate.

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82.

How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?

A.None
B.One
C.Two
D.Three

Answer: D

Correct answer: Three

Writing 421579368 in ascending order gives 123456789, and comparing the two, three pairs of digits keep the same number of digits between them in both arrangements. So the answer is three.

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83.

How many 4's are there preceded by 7 but not followed by 3?

5 9 3 2 1 7 4 2 6 9 7 4 6 1 3 2 8 7 4 1 3 8 3 2 5 6 7 4 3 9 5 8 2 0 1 8 7 4 6 3

A.Four
B.Three
C.Six
D.Five

Answer: A

Correct answer: Four

Four 4s have a 7 before them and something other than 3 after them: 7 4 2, 7 4 6, 7 4 1 and the last 7 4 6. The 4 in 7 4 3 is ruled out by the 3 that follows it. So the answer is four.

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84.

In a row of boys, If A who is 10th from the left and B who is 9th from the right interchange their positions, A becomes 15th from the left. How many boys are there in the row ?

A.23
B.31
C.27
D.28

Answer: A

Correct answer: 23

After the exchange A stands where B stood, and A is then 15th from the left - so B was 15th from the left. B is also 9th from the right, so the row holds \[ 15 + 9 - 1 = \mathbf{23} \] boys.

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85.

Sam ranked 9th from the top and 38th from the bottom in a class. How many students are there in the class ?

A.45
B.47
C.46
D.48

Answer: C

Correct answer: 46

Sam is counted from both ends, so the class holds \[ 9 + 38 - 1 = \mathbf{46} \] students.

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86.

Nitin ranks 18th in a class of 49 students. What is rank from the last ?

A.31
B.18
C.32
D.19

Answer: C

Correct answer: 32

In a class of 49, a rank of 18 from the top is \[ 49 - 18 + 1 = \mathbf{32} \] from the last.

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87.

How many such digits are there in the number 7346285 which are as far away from the beginning of the number, as they will be when arranged in ascending order within the number?

A.None
B.one
C.Two
D.Three

Answer: C

Correct answer: Two

Arranged in ascending order the digits of 7346285 run 2, 3, 4, 5, 6, 7, 8. Comparing position by position, only 3 (second in both) and 4 (third in both) keep their places - so the answer is two.

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88.

Three persons A, B and C are standing in a queue. There are five persons between A and B and eight persons between B and C. If there be three persons ahead of C and 21 persons behind A, what could be the minimum number of persons in the queue?

A.41
B.40
C.28
D.27

Answer: C

Correct answer: 28

Three people stand ahead of C, so C is 4th. Eight people separate B from C, putting B at the 13th place, and five separate A from B, with A ahead of B at the 7th place. Twenty-one people stand behind A, so the queue holds \[ 7 + 21 = \mathbf{28} \]

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89.

In a queue, Amrita is 10th from the front while Mukul is 25th from behind and Mamta is just in the middle of the two. If there be 50 persons in the queue. What position does Mamta occupy from the front ?

A.14th
B.16th
C.18th
D.20th

Answer: C

Correct answer: 18th

Mukul is 25th from behind in a queue of 50, so he is \( 50-25+1 = 26 \)th from the front. Mamta stands midway between the 10th and the 26th place: \[ \frac{10+26}{2} = \mathbf{18} \text{th} \]

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90.

A class of boys stands in a single line, One boy is 19th in order from both the ends, How many boys are there in the class ?

A.37
B.39
C.27
D.38

Answer: A

Correct answer: 37

The boy is counted from both ends, so the class holds \[ 19 + 19 - 1 = \mathbf{37} \] boys.

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Number, Ranking and Time Sequence Test Questions and Answers

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Number, Ranking and Time Sequence Test Questions and Answers

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