REASONING TIME SEQUENCE AND NUMBER

                    RANKING, TIME SEQUENCE AND NUMBER  

In   this type of question ranking of person ,order, etc like situation are asked.

Question 1: If 3 is subtracted from the middle digit of each of the following  numbers and then the positions of the digits are reversed, which of the following will be the last digit of the middle number after they are arranged in descending order ?  [BANK PO  2000]

  589  362  554   371   442

a)        1  B)     2   c)  3    d) 4     e ) 5

Solution :

     Given digits

    589  362  554   371   442

 Step 1) subtracting 3 from middle digit ,then number becomes

                    559  332   524   341    412

 Step 2) then position of each digit in  number is reversed. Now

                955    233   425   143    214

Step 3) then arrange the all number in step 2) number in descending order

                955      425      233       214       143

      Here middle number is 233 and last digit is its 3

     Therefore  option c) is correct.

Question 2: Rohan ranks seventh from the top and twenty-sixth from the bottom in a class. How many students are there in the class ?.

a)      31              .b)    32             c)    33              d)  34

Solution: in   this type of question make the position from top and bottom.

     Calculate all possibilities here two possibilities arises

  If we do not know that gap between top and bottom::    given that Rohan ranks seventh from the top and twenty-sixth from the bottom in a class. Seventh position from top thus, its position is fixed. And twenty-sixth from the bottom in a class since we do not know the how many students between them. Thus we are not able to tell how many students in the class.

  If we do  know that gap between top and bottom:: given that Rohan ranks seventh from the top and twenty-sixth from the bottom in a class. Seventh position from top thus, its position is fixed. And twenty-sixth from the bottom in a class since we do  know the how many students between them i.e. only that of students. Thus we are not able to tell how many students in the class.

      Thus

     (Top position -1) +1 +(bottom position -1)

=  6 +1 +25

=32

Therefore option b) is correct  if other option are eliminated .

Question 3: if day after tomorrow is Saturday, what day was three days before yesterday ?.[ssc 2002]

a)      Sunday   .b)  Monday     c)  Thursday      d)  Saturday

Solution:

       Day after tomorrow is “Saturday” .i.e. today is “Thursday”, then yesterday will be “Wednesday” and three day before “Wednesday” will be “Sunday”. Thus option b) is correct.