Reasoning - Number, Ranking & Time Sequence
1.
In a row of students Ram is seventh from the left and Sita is twelfth from the right If they interchanged their positions Ram becomes twenty-second from the left How many students are there in the row?
Answer
Ram's new position is 22nd from left. But it is the same as Sita's earlier position which is 12th from the right.
Thus, the row consists of (21 + 1 + 11) = 33 boys.
Answer :
Option CExplanation :
Ram's new position is 22nd from left. But it is the same as Sita's earlier position which is 12th from the right.
Thus, the row consists of (21 + 1 + 11) = 33 boys.
2.
In a class of 60, where girls are twice that of boys, Raman ranked seventeenth from the top. If there are 9 girls ahead of Raman, how many boys are after him in rank ?
Answer
Let the number of boys be x. Then, numbers of girls = 2x.
⇒ x + 2x = 60 ⇒ x = 20.
So, number of boys = 20 and numbers of girls = 40.
Number of students behind Raman in rank = (60 − 17) = 43.
Number of girls ahead of Raman in rank = 9.
Number of girls behind Raman in rank = 40 − 9 = 31.
∴ Number of boys behind Raman in rank = 43 − 31 = 12.
Answer :
Option CExplanation :
Let the number of boys be x. Then, numbers of girls = 2x.
⇒ x + 2x = 60 ⇒ x = 20.
So, number of boys = 20 and numbers of girls = 40.
Number of students behind Raman in rank = (60 − 17) = 43.
Number of girls ahead of Raman in rank = 9.
Number of girls behind Raman in rank = 40 − 9 = 31.
∴ Number of boys behind Raman in rank = 43 − 31 = 12.
3.
Ram ranked 9th from the top and 38th from the bottom in a class. How many students are there in the class ?
Answer
The whole class consists of :
8 students who have a rank higher than Ram,
Ram, and
37 students who have rank lower than Ram
i.e. (8 + 1 + 37) = 46 students.
Answer :
Option BExplanation :
The whole class consists of :
8 students who have a rank higher than Ram,
Ram, and
37 students who have rank lower than Ram
i.e. (8 + 1 + 37) = 46 students.
4.
If Atul finds that he is twelfth from the right in a line of boys and fourth from the left, how many boys should be added to the line such that there are 28 boys in the line ?
Answer
Number of boys in the line = (11 + 1 + 3) = 15.
∴ Number of boys to be added = 28 − 15 = 13.
Answer :
Option BExplanation :
Number of boys in the line = (11 + 1 + 3) = 15.
∴ Number of boys to be added = 28 − 15 = 13.
5.
In a row of trees, one tree is fifth from either end of the row. How many trees are there in the row ?
Answer
Number of trees in the row = (4 + 1 + 4) = 9.
Answer :
Option BExplanation :
Number of trees in the row = (4 + 1 + 4) = 9.
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