1. 100 balls are there .. 20 red, 20 blue, 20 yellow, 20 green, 20 black...you have to take out balls blindly... find the min. no. of attempt to take out 2 balls of same color.

Answer : 6

Approach :  There r 5 groups r there(r, blue, y, g, black) so we have 2 pick up at least 6 balls.

2.My Grandfather brought a clock at 8o clock it strikes for 7 sec.How many seconds it strikes each day on whole.

Answer : 132
Approach : (2*(11+10+9+8+7+6+5+4+3+2+1+0))

3. Two persons met each other. One person is having certain age and the other person is having half the age of first person plus seven years. After 10 years they got married the bride age is 30 years and the groom's age is 9/10th of the bride. What is the groom's age.

Answer : 

let the age of first person=x
Then the other person's age is x/2 + 7
After 10 years they got married means
X+10 and x/2 + 7 + 10
And x+10=30
Then x=20 and x/2+7+10 = 20/2 + 7 + 10
= 10 + 7 +10
= 27
(9/10)*30=27
Hence the groom's age is 27

4. It was to determine a five digit number.
various conditions were given
a)two digits are prime
b)no repeated digits
c)digit 5 is half of digit 4
d)digit 1 is one less than digit 3
e)digit 3 is the largest.
f)digit 2 is the smallest.
g)digit 5 lies between digit 1 and digit 2.

Answer : 71842

5. A slow coach train starting from Amritsar at 9:00 am reaches Delhi by 9:30am after 3 days and vice versa.If a slowcoach train starts from Delhi to Amritsar, how many trains will it meet on its way to Amritsar?

Answer :

7 trains.

Let us consider that today is Monday.

Train starts from Delhi at 9:00 am on Monday and reaches Amritsar on Thursday at 9:30 am.

The trains that will come on its way are

Trains from amritsar on: Fri Satur Sun Mon Tues Wedn Thurs

Reaches delhi on : Mon Tues Wed Thurs Fri Sat Sun

The above trains are all the trains which come to our train on its way.

So totally there are 7 trains.

6. Find the next term of the series:
a) 1,2,3,5,16,__
b) 1,2,3,8,__,224

Answer :

a) 231 (2^2 - 1^2 = 3, 3^2 - 2^2 =5, ......16^2 - 5^2 = 231)

b) 27 (2*1+1=3, 3*2+2=8, 8*3+3=27)

7. Samantha younger than jack and older than louise, louise older than edward and younger than jim (something names r like in that order) Who is youngest person?

Answer : EDWARD very simple we have 2 club all conditions around 6, then we will get youngest person

8) cubes problem i.e is from previous papers](12 marks)
the surface of the cube is painted with red colour. By six straight cuts 27 cubes are formed then

a) how many cubes are there with 0 side red colour
b) how many cubes are there with 1 side red colour
c) how many cubes are there with 2 side red colour
d) how many cubes are there with 3 side red colour

Answer :

0 faces coloured-1
1 faces coloured-6
2 faces coloured-12
3 faces coloured-8

9.  X Y Z X Y Z
+ A B AND - A B
--------------- ---------------
C D E F B G A
Find X,Y,Z,G.

Answer :

9 4 5 9 4 5
+ 7 8 AND - 7 8
--------------- ---------------
1 0 2 3 8 6 7

X=9, Y=4, Z=5, G=6.

10. question on clock and time.
Quarter of time from midnight to present when added to half the time from present to midnight gives the present time.what is the present time.

Answer :  9:36