Solution:

Two wrong dont make a right

Solution:

If you see the picture, they formed a pentagonal shape and achieved the required.

Solution:

See the figure for the answer. Wasn't it a bit tricky?

Solution:

The girl was born on 29 February. Thus her birthday came once in four years only while her sister was born on a normal day and celebrated her birthday every year. Thus the girl had a chance of depositing money only 10 times in 4 years through which she collected $2500 while her sister took $50 from the piggy bank every year making the total amount to be $2000. Thus when the piggy bank was opened, it had just $500.

Solution:

The teacher will use a simple trick to form a perfect impression. He will ask all his students to raise their hands on each of the question that is asked. But the only catch will be that those who knows the answer correctly will raise their right hand and others will raise their left hand.

In this way, the principal will see all the hands being raised for each question even though all won't be knowing the correct answer. The teacher will ask only those who know the answer and they will always be correct. So the principal will be impressed to full extent.

Solution:

Shikhar hit a sixer and then got retired hurt.
Suresh Raina came but he got run out after he and Kohli had crossed halfway.
On the next ball, Kohli scored a six and was not out at 100.

Solution:

The two numbers are 4 and 13 whose product is 52 and sum is 17.

Solution:

Solution is shown in image below

Solution:

457730 * 4 = 1830920
(DOLLAR * 4 = QUARTER)

Solution:

Playing chess

Game needs two players so Brother-8 is playing chess with Brother-2

Solution:

2 minutes (duration between 9:59 and 10:01)