INFOSYS SOLVED

1. 
   When I add 2 times my age 2 years from now to 4 times my age 4 years from now, I get 10 times my current age. How old will I be 15 years from now?
   A 12
   B 20
   C 25
   D None of these
   Ans B
   Hints:
   Let current age= x
   2(x+2) + 4(x+4)=10x
2. A set of football matches is to be organized in a "round-robin" fashion, i.e., every participating team plays a match against every other team once and only once. If 36 matches are totally played, how many teams participated?
   A 5
   B 8
   C 9
   D 10
   Ans C
   Hints:For a match u need 2 teams.suppose there r totally 'n 'teams.Now uve to choose 2 teams out of 'n' teams.so answer =no of such choices=no. of possible combinations. So we've ans = nC2=36;solve to get n=9.Sol: n(n-1)/2=36. so n=9
3. One guy has Rs. 100/- in hand. He has to buy 100 balls. One football costs Rs. 15/, One Cricket ball costs Re. 1/- and one table tennis ball costs Rs. 0.25 He spend the whole Rs. 100/- to buy the balls. How many tennis balls he bought?
   A 56
   B 80
   C 9
   D 10
   Ans A
   Hints:
   F + C + T = 100-------------eq1 15F + C + 0.25T = 100-------------eq2 eq1=eq2 .solve to get F=3T/56 ;F=3,T=56,C=41
4. A tennis championship is played on a knock-out basis, i.e., a player is out of the tournament when he loses a match. How many players participate in the tournament if 30 matches are totally played?
   A 60
   B 61
   C 30
   D 31
   Ans D
   Hints:
   u don't need to sum it up.since it's a knock out only 1 person emerges winner finally.so30+1=31is answer.becos after30 matches finally we shud've 30losers and 1winner.
5. A rich merchant had collected many gold coins. He did not want anybody to know about them. One day, his wife asked, "How many gold coins do we have?" After pausing a moment, he replied, "Well! If I divide the coins into two unequal numbers, then 37 times the difference between the two numbers equals the difference between the squares of the two numbers." The wife looked puzzled. Can you help the merchant's wife by finding out how many gold are?
   A 35
   B 37
   C 50
   D 57
   Ans B
   Hints: 37(x-y)=x2 – y2. u no tht x2- y2=(x-y)(x+y).so (x-y) cancels on both sides to give x+y=37.so sum of unequal halves=37 which is the req answer
6. Suppose 8 monkeys take 8 minutes to eat 8 bananas. How many minutes would it take 5 monkeys to eat 5 bananas?
   A 5
   B 25
   C 1
   D None of these
   Ans D
   Hints:
   each mky takes 8 min to eat a banana
7. A 31" x 31" square metal plate needs to be fixed by a carpenter on to a wooden board. The carpenter uses nails all along the edges of the square such that there are 32 nails on each side of the square. Each nail is at the same distance from the neighbouring nails. How many nails does the carpenter use?
   A 32
   B 31
   C 124
   D 10
   Ans C
   Hints:
   Ans= 32*2 + 30*2=124
8. It was vacation time, and so I decided to visit my cousin's home. What a grand time we had! In the mornings, we both would go for a jog. The evenings were spent on the tennis court. Tiring as these activities were, we could manage only one per day, i.e., either we went for a jog or played tennis each day. There were days when we felt lazy and stayed home all day long. Now, there were 12 mornings when we did nothing, 18 evenings when we stayed at home, and a total of 14 days when we jogged or played tennis. For how many days did I stay at my cousin's place?
   A 22
   B 31
   C 11
   D 10
   Ans A
   Hints:
   Use sets and venn diagram to solve such questions.a,b ,aub,anb etc. 12=tennis+leave 18=jog +leave so jog-tennis=6 again jog+tennis=14.so solve and get jog=10,leave=8,tennis=4.so tot=22
9. . Sudeep and Udayan each have a collection of cricket balls. Sudeep said that if Udayan would give him 2 of his balls they would have an equal number; but, if Sudeep would give Udayan 2 of his balls, Udayan would have 2 times as many balls as Sudeep. How many balls does Sudeep have?
   A 14
   B 10
   C 11
   D 8
   Ans B
   Hints:
   S+2=U+2;
   2(S-2)=U+2;
   solve it.
10. There are total 15 people. 7 speaks french and 8 speaks spanish. 3 do not speak any language. Which part of total people speaks both languages.
    A 1/3
    B 1/4
    C 1/5
    D 1/6
    Ans C
    Hints:
    n(fus)=15-3=12
    n(f ^ s)=n(f)+n(s)-n(fus)
    =7+8-10=3