Number, Ranking and Time Sequence Test Questions

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?

A) None B) One
C) Two D) Three
 
Answer & Explanation Answer: D) Three

Explanation:

Given Number:     4  2  1  5  7  9  3  6  8

 

Ascending order:  1  2  3  4  5  6  7  8  9

 

Hence the required pairs are  12, 49, 16

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400 30789
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

A) Four B) Three
C) Six D) Five
 
Answer & Explanation Answer: A) Four

Explanation:

7  4  2

7  4  6

7  4  1

7  4  6

 

Only at these placees 4 is preceded by 7 but not followed by 3

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162 24114
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 ?

A) 23 B) 31
C) 27 D) 28
 
Answer & Explanation Answer: A) 23

Explanation:

Clearly, A’s new position is 15th from the left. But this is the same as B’s earlier position which is 9th from the right.

 

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281 14509
Q:

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 & Explanation Answer: C) 46

Explanation:

Number of students in class = (8 + 1 + 37) = 46

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58 8519
Q:

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

A) 31 B) 18
C) 32 D) 19
 
Answer & Explanation Answer: C) 32

Explanation:

Number students behind the nitin in rank = (49 - 18) = 31

Nitin is 32nd from the last

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132 7399
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?

A) 41 B) 40
C) 28 D) 27
 
Answer & Explanation Answer: C) 28

Explanation:

Three persons A, B, C can be arranged in a queue in six different ways, ie ABC, CBA, BAC, CAB, BCA, ACB. But since there are only 3 persons ahead of C, so C should be in front of the queue. Thus, there are only two possible arrangements, ie CBA and CAB.

 

We may consider the two cases as under:

Case I:  3C8B5A21

 

Clearly, number of persons in the queue = (3+1+8+1+5+1+21=) 40

 

Case II:  3C A5B

 

Number of persons between A and C                  

 

= (8 - 6) = 2   

[C8B A21B]

 

Clearly number of persons in the queue = (3+1+2+1+21) = 28

 

Now, 28 < 40. So, 28 is the minimum number of persons in the queue.                                                     

 

 

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60 5574
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?

A) None B) one
C) Two D) Three
 
Answer & Explanation Answer: C) Two

Explanation:

Given Number : 7346285

Ascending Number : 2345678

Answer is Two. Those digits are 3,4

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39 5509
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 ?

A) 37 B) 39
C) 27 D) 38
 
Answer & Explanation Answer: A) 37

Explanation:

Number of boys in the class = (18 + 1 +18) = 37

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94 5194