19. A train 130 metres long and travelling at 45 km/hr can cross a bridge in 30 seconds. Find the length of the bridge.

Answer:

245 m.  

Explanation:

Speed =		45 x	5	m/sec	=		25	m/sec.
			18				2

Time = 30 sec.

Let the length of bridge be x metres.

Then,	130 + x	=	25
	30		2

 2(130 + x) = 750

 x = 245 m.

18. Pointing to a lady a person said, "The son of her only brother is the brother of my wife." How is the lady related to the person?

Answer:

Sister of father-in-law 

Explanation:

Brother of person's wife → brother-in-law of the person. Hence, the son of lady's brother is brother-in-law of the person.

Therefore, the brother of the lady is the father-in-law of the person. Hence, the lady is the sister of the person's father-in-law.

17. The angle of elevation of the sun, when the length of the shadow of a tree 3 times the height of the tree, is??

Answer:
30º

Explanation:

Let AB be the tree and AC be its shadow.

Let ACB = .

Then,	AC	=	3          cot  = 3
	AB

  = 30º.

16. Find the output.

int main()
{
int ***r, **q, *p, i=8;
p = &i;
q = &p;
r = &q;
printf("%d, %d, %d\n", *p, **q, ***r);
return 0;
}

Answer:
8,8,8

15. Find the Next no

If
5+3+2=151012 ,
9+2+4=183662.
8+6+3=482466,
5+4+5=202504
then what ll be the answer of
7+2+5=??????

Answer:
143542

Explanation:
a+b+c = (a*b)&(a*c)&reverse[b(a+c)]

14. The sum of a positive number and its reciprocal is thrice d difference of d number and its reciprocal. Find d number?

Answer:
√2 (Root 2)

13. Total monthly salary of 4men and 2women is 46,000. If woman earn 500 more than man, then the salary of woman??

Answer:
Rs. 8000
Explanation:
Let x be salary of man.
y be salary of woman.
Then,
4x+2y=46000
x=y-500.
By solving above 2 equations we get y=8000

12. Find the speed of the 2nd train.

A train 108m long moving at a speed of 50km/hr crosses a train 112m long coming from opposite direction in 6sec.The speed of the 2nd train is??


Answer:
82 km/hr

Explanation:

Let the speed of the second train be x km/hr.

Relative speed	= (x + 50) km/hr
	= (x + 50) x 5 m/sec 18
	= 250 + 5x m/sec. 18

Distance covered = (108 + 112) = 220 m.

	220	= 6
	250 + 5x 18

 250 + 5x = 660

 x = 82 km/hr.

11. Find the direction.

If South-East becomes North, North-East becomes West and so on. What will West become?

Answer: 
South - East

Explanation:

It is clear from the diagrams that new name of West will become South-East.

10. What is the age of the youngest child?

The sum of the ages of 5 children born at the interval of 3 years each is 50 years. What is the age of the youngest child?

Answer: 
4 years.

Explanation:
Let the ages of the children be x, (x + 3), (x + 6), (x + 9) and (x + 12) years.
Then, x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50
     =>5x = 20
     =>x = 4.
Therefore, Age of the youngest child = x = 4 years.

9. Find the number.

When 75% of a number is added to 75, it results in the number itself. Find the number?

Answer:
300
Explanation:

Let the number be ‘x’. 75% of x can be written as 3/4x.

Given, 3/4x+75=x

Solving gives x=300.

8. Find the next no.

 7-3=10124
6+3=9279
5-2=763
11+2=132613
15-3=? ?

Answer: 
183612

7. Find the length of the wire.

A copper sphere of diameter 9 cm is melted and drawn into a wire of 2 mm diameter. The length of the wire is???

Answer:  
1093.5 mm or 1.1m (approx)
Explanation:
Volume of Sphere = Volume of wire(cylinder)
4(pi*R^3)/3 = pi*r^2*h
R=4.5 & r=1mm
h=1093.5 mm or 1.1m(approx)

6. Predict the output

main()
{
static int var = 5;
printf("%d ",var--);
if(var)
main();
}

Answer:
5 4 3 2 1
Explanation:
When static storage class is given, it is initialized once. The change in the value of a static variable is retained even between the function calls. Main is also treated like any other ordinary function, which can be called recursively.

5. Find the missing no?

Find the next term in the following series:
3, 5, 5, 19, 7, 41, 9, ?

Answer: 
71
Explanation:

The actual series is in this form

3, 3*2-1, 5, 5*4-1, 7, 7*6-1, 9, so the next term must be 9*8-1=71

4. How many bananas did he eat on the first day?

A man ate 100 bananas in five days,each day eating 6 more than the previous day. How many bananas did he eat on the first day?

Answer: 
8

3. What's the man's age?

A man is three times as old as his son. Five years later he will be two and a half times as old as his son.What's the man's age?

Answer: 
Age of the man = 45
Explanation:
Let the age of son & father be x & 3x.
After 5 yrs
son=x+5
father=3x+5
Also given,
2.5(x+5)=3x+5,
solving gives x=15.
fathers age=3x=45

2. Find the length of the wall.

If 20 men build a wall of length 56m in 6 days , what length of a similar wall can be build by 35 men in 3 days?

Answer: 
49m

1. Find the number.

What will be the 18th term in the following series?
0, 6, 6, 20, 20, 42,...?

Answer: 
342

Explanation: 
The series is of the form
(1*1)- 1
(2*2)+2
(3*3)- 3
(4*4)+ 4
(5*5)- 5
So the 18th term will be 
(18*18)+18=342.

Find the next letter

What is the next letter in this sequence OTTFFSS?

Answer: E

Explanation:
One
Two
Three
Four
Five
Six
Seven
Eight


So the intial of the letters is given,thefore answer is E

Find the no. of zeros.

A certain street has 1000 buildings. A sign maker is contracted to number the houses from 1 to 1000. How many zeros will he need?

Answer: 
192 zeros.

Age calculation

Rohit was 4 times as old as his son 8 years ago. After 8 years, Rohit will be twice as old as his son. What are their present ages?

Answer: 
Son's present age = 16 years
Rohit's present age = 40 years


Explanation:
Let son's age 8 years ago be x years. Then, Rohit's age 8 years ago = 4x years.
Son's age after 8 years = (x+8)+8 = (x+16) years.
Rohit's age after 8 years = (4x+8)+8 = (4x+16) years.
2(x+16) = (4x+16)  <=> 2x = 16 <=> x = 8.
Hence, son's present age = (x+8) = 16 years.
           Rohit's present age = (4x+8) = 40 years.