aptitude questions for TCS students

 

PERCENTAGES

1) If 70 % of the students in a school are boys.And the no of girls be 504.Find no of boys.

 

        504*100      = 1680.   

            30          

 

        1680*70      = 1176 boys.

                  100

2) In an examination 65 % of students are passed and no of failures is 420.Find the total strength?

        420*100      =1200   

            35         

 

3) In an examination,a student scored 30% marks from the first paper out of 180.How much % should he score from 2 nd paper out of 150 if he is to get an overall average of atleast 50 %?

 

    I 180                          180*30   =54

                                              100

    II 150

        330                         111 * 100 = 74 %

                                       150

        330     = 165.

          2

       

4) In an exa,mination a student scored 30 % marks from the I paper out of 150.How much % should he score out of 120 if he is to get an overall percentage of atleast 50 %?         

     I  150                        30 * 150 = 45

                                     100

    II  120                         90 * 100 = 75 %

                                      120

         270

         

           270 = 135

             2

 

5)In an examination a student scored 30 % marks from I paper out and he is failed by 15 marks and another student who scored 40 % mark and he obtained 35 mark more than pass mark.Find pass mark?

     Maximum mark = Addition of difference in pass mark.

                                     Difference of scoring percentage

                                = 50 * 100 = 165

                                   10

 

          500 * 30 = 150 + 15 = 165

                   100

          500 * 40 = 200 – 35 = 165

                   100

         

             165 * 100 = 33 %

             500

6) In an exam 42 % of students failed in Hindi.52 % failed in English.If 17 % failed in both,find % of students passed in both ?

                           100 – 77 =23 %

7) The price of sugar was increased by 25 %.How much % the house holder reduce the consumption so their expenditures remains the same 

         For increase     R         * 100

                            100 + R                                  25      * 100 = 20 %

         For decrease    R          * 100                   125

                             100 - R

8) If A's income is 20 % less than B's income .In how much % B's income is more than that of A?

               A          B

              800     1000

      

              200 * 100 = 25 %

              800

 

9) In an election between 2 candidates, one gets 62 % of votes and he is elected by majority of 144 votes .Find the no of votes.

 

               144 * 100              62 % - 38 % = 24 %.

                         162

 

               144 * 100  = 600

                           24

10) In an election between  2 candidates ,one gets 30 % of the voter and id defeated by 15000 votes.Find no of votes of winning candidate?

 

                    15000 * 100 = 3750 * 70

                                    40                100

                                 (OR)

                    40 %             15000               = 26250.

                    70 %                 ?

 

11) In an election between 2 candidates,one gets 55 % of total valid votes.20 % of votes were invalid.If the no of votes was 7500,so find the no of votes polled by defeated candidate.

 

         Valid = 6000

 

           55 %                 6000

 

  45 %                     ?= 2700.12) 10 % of voters did not cast their votes in an election between 2 candidates.10 % of the polled were invalid and one gets 54 % of the total valid votes and he is elected by the majority of 1620 votes.Find the number of votes enrolled on voter's list   

8  %                   1620

                  100 %                        ?

 

                  = 1620 * 100      = 20250.

                           8    

 

                  20250 * 100 = 22500

                      90

                     

                   22500 * 100 = 25000

                       90

 

13) The population of the town increased by 10 % in the ! St year and 20 % in the 2 nd year.The population after 2 years will be ? The population is 8000 ?

 

               8000                  10 %                                    n

                 800                                      Pop (1 + r     

               8800                   20 %                         100

               1760                                      Future * 100 + R ,   Past Pop *100

              10560                                      Pop            100                      100 + R

 

14) The population of the town increased by 5% every year. If the present population is 15435?

 

                15435 * 100 * 100 = 14000

                              105     105

 

15) In a mixture of 40 litre of milk and water contains 10 % water.How much water should br added to this so that water becomes 20%?

                    M  36     To add milk,

         40                        36            80%               Total water

                    W 4            ?             20%                20 * 30     = 9litres. 9-4 = 5 litres.

                                                                                80 

 

16) A man sends 75 % of his income.If his income is increased by 20%,he increases his expenditure by 10 %.His savings are increases by how much %?

 

                100                    75 = 25        12.5 * 100 = 50%

                120                    82.5 = 37.5    25

 

17) A man donated 5% of his income to a trust and deposited 20% of remainder in a bank.If he now has Rs 1919.What is his income?

                    5%

           100    =        95

                    20%

              95   =        19

                                76

 

                 100 = 76

                   ? = 1919

    =2525