Solution:

0488

Explanation
A) Its a 4 digit number. --- 0488

B) Its first digit is of no use --- 0 at the start is of no use.

C) Its third and fourth digit is the mirror image of each other. --- 8 is the only digit which is a mirror image of itself.

D) The second digit is half the third. --- 4 is half of the digit 8.

Solution:

11

Explanation:
Tzu‑ying won 3 games
V.Sindhu must win 3(to balance 3 games she lost) + 5 games(required for min 50$) = 8 games
Total Games = 3 + 8 = 11 games.

Solution:

Carriage

Explanation:
2Car + 3Carriage = 2 Bus ........(1)
2Car + 1Carriage = 1 Bus + 1Carriage ..... (2)
1 Bus + 1Car + 1Carriage = 3car + ?

From Statement 2 ,
2Car = 1Bus
From Statement 1 ,
2Car + 3Carriage = 2 Bus
1Bus + 3Carriage = 2 Bus
=> 3Carriage = 1Bus
Hence
The Carriage = 2, the Car = 3 and the Bus = 6

Solution:

The riddle, the 'facts' of which may or may not be true, results in the following equation:

x/6 + x/12 + x/7 + 5 + x/2 + 4 = x

where x is Abhishek's age at the time of his death.

Therefore, salmna lived exactly 84 years.

Solution:

Let the length of the bridge be x meters.
Running towards the train, Charles covers 0.5x-10 meters in the time that the train travels x-4 meters. Running away from the train, Charles covers 0.5x+2 meters in the time that the train travels 2x-8 meters.

Because their speeds are constant, the following holds:

(0.5x-10) / (x-4) = (0.5x+2) / (2x-8)
which can be rewritten to
0.5x2 - 24x + 88 = 0
Using the abc formula we find that x=44, so the railway-bridge has a length of 44 meters.

Solution:

The number is: 12345679
12345679 * 9 = 111111111
12345679 * 18 = 222222222
12345679 * 27 = 333333333
And so on...

Solution:

54

It takes 3 hours for the Simpson & Stewie to meet.
so the eagle flies for 3 hours at 18 Km/hr = 54 kms

Solution:

There are 49 steps.

He hears the bird singing on step 33. He picks up the pebble on the 21st step and tosses it on the 22nd step. The remaining 27 steps are taken three at a time which is 9 pac

Solution:

99+9/9 = 100

Solution:

14 horses and 8 men.<br><br>If, A --> men and B --> horses<br>
So, A + B = 22 and 2A + 4B = 72<br>2 (22 - B) + 4 B = 72<br>44 - 2 B + 4 B = 72<br>44 + 2 B = 72<br>2 B = 72 - 44 = 28<br>B = 14 (horses)<br><br>
So, there are in the stable 8 men and 14 horses.