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  

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147 9774
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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56 7342
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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175 4172
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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89 2790
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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71 2360