Hai,
It's Himanshu Rajendrakumar Khatri. I had written Infosys on 11th June at 
I had interview on 13th at Infosys centre.  Here are the questions that appeared in the test. I tried to give the exact words from the test & I think I did well. Also I had given detail answers.
Q.1) Dr. Watson has 5 nephews. After he died he mentioned in his will that  each of his brother's sons should get money according to their ages. The difference between each son is Rs. 20 & youngest son got least money. Total money to be shared is 1000. How much youngest son will get? 
Ans: 
Let the third i.e. middle son will get Rs. x then youngest son will get Rs. x-40.
=>      Adding their shares = 1000 
=>      (x-40) + (x-20) + x + (x+20) + (x+40) = 1000 
=>      x = 200 
=>      x - 40 = 160 
=>      Youngest son will get Rs.160
  
Q.2) In a party there r total 1275 handshakes assuming each person did handshake with other fellow. How many people attended the party? 
Ans: 
Let number of people attended the party = x then 
Number of handshakes =xC2 = 1275 
=>      x * (x - 1)     =      1275 
             2 * 1 
=>      x2 - x - 2550 =0 
=>      (x - 51)(x + 50) = 0 
=>     x cannot be negative 
=>      x = Number of people attended party =51
  
Q.3) If one fifth of a hive of bees flew to the rose flower, one third flew to the lotus flower, three times the difference of these two numbers flew to slandbara & one bee continued to fly about, attracted on each side by the fragrant of ketaki & malati, what was the total number of bees? 
Ans: 
          X + X + 3( X - X ) +1 = X 
          3     5        3    5 
=>      X = 15 = Number of bees. 
  
Q.4) Due to some defect in our elevator, I was climbing down the staircase. I had climbed down just 7 steps when I saw professor Zorkoski on the ground floor. Continuing to walk down, I greeted him & I was surprised to see that when I was yet to get down 4 steps to reach the ground floor, professor had already finished the climbing up 2 steps for every 1 of mine. How many steps did the staircase have? 
Ans: 
                         7                 X               4 
                   |-------------- |------------------|----------------| 
  
From figure, equation becomes : 
7 + X + 4 = 2X 
=>      X = 11 
=>      Total number of steps = 7 + 11 + 4 = 22
  
Q.5) Complete the following series: 
a)    3, 6, 13, 26, 33, 66, ? 
Ans: 
              3 * 2 = 6 
              6 + 7 = 13 
              13 * 2 = 26 
              26 + 7 = 33 
              33 * 2 = 66 
              66 + 7 = 73 
              73 * 2 = 146 
Series : 3, 6, 13, 26, 33, 66, 76, 146
b)    364, 361, 19, 16, 4, 1, ? 
Ans: 
              364 - 3 = 361 
              O(364) = 19 
              19 - 3 = 16 
              O(16) = 4 
              4 - 3 = 1 
              O(1) = 1 
              1 - 3 = -2 
Series: 364, 361, 19, 16, 4, 1, 1, -2
Q.6) A man was asked to meet a lady lawyer who had a good logical skill. Today is Saturday. A man wanted her appointment. She called her three days after the day before the day after tomorrow. What is the appointment day? 
Ans: 
              Today =  Saturday 
              Day after tomorrow = Monday 
              Day before the day after tomorrow = Sunday 
              Three days after the day before the day after the tomorrow = Wednesday 
              Therefore, Appointment day is Wednesday.
  
Q.7) Find the values of X, Y, Z & B using following equations. Substitute values from 0 to 9 without repetition. 
     X  Y  G                            X  Y  G 
      +                                    - 
         A  B                                A  B 
     --------------                        -------------  
    C  D  E  F                          B  G  A 
Ans:            9  4  5                            9  4  5
                   +                                    - 
                       7  8                                7  8 
                ---------------------             -------------------
                 0   2  3                             8  6  7
  
Q. 8) Somebody asked a wizard, Alchimiro about his age. He answered that he is still young according to age of wizards. Let me tell u, I m thrice my son's age & my father's age is 40 more than twice of my age. Total of our ages is 1240 years. What is the age of wizard? 
Ans: 
          Let wizard's son age = X then wizard's age = 3X & his father's age = (6X+40) 
=>      X + 3X + 6X + 40 = 1240 
=>      X = 120 
Wizard's age = 360 years 
  
Q.9) This was 8 marks question regarding the committees of 5 juniors & 4 seniors they have to form 3 committees. Some conditions had given & based upon that we have to answer 4 questions. I solved it last. Sorry for not remembering the question. 
  
Q.10) A man enquires a person about the past 5 day's temperature at 
Ans: Temperatures on 5 consecutive days are: -2, -1, 1, 2, 3 in degree Celsius. 
  
HR interview was cool. They didn't ask me to explain myself, a most imp question. Being a chemical engineer they keep asking me why you are not interested in chemical industry & what u did in last 1 year. I explained them all truly & they look convinced. So my advice is be true to them, they are among top mind readers. They will easily catch your bluffs. They asked me which concept from computer u like most. I told them about OOPS & explained it. They also asked me how u will adjust within a team. Such HR questions. Then they had given me a simple puzzle. 
Well this is all about my Infosys experience. I am waiting for the result.