You can write numeral 1 in several ways but they will not be the largest numbers.

11 = 11       or       11 x 11        or       11 + 11     or       11/11        or         1111

This is the right way to rewrite it   11¹¹  . Now this is the largest number among all the numbers.

Answer to Game No 12: Lion, Goat and Grass

First Round - The man will first take the goat and leave it on the other side.

Second Round - Then he will take the lion and leave it on the other side, but while returning he will bring back the goat with him, otherwise lion will eat the goat - thus there is only lion on the other side.

Third Round - Then he will take the grass, and leave the goat on the first side of the river. He will drop the grass on the other side of the river. Lion is already there, he doesn't eat the grass.

Then he will come back to take the goat to the other side of the river.
That is how he will transport all the three safely to he other side of the river in four rounds.

Answer to Game No 13:  Lighter Ball

The jeweler put 3 balls on one side of the scale and 3 balls on the other side. He did not find any difference. Then he picked 2 balls from the remaining ones and weighed against each other. If the lighter ball was on the scale, the lighter ball side will rise, if it is not one of them, then the remaining one is the lighter one.

On the other hand, if the lighter ball was among the two sets of 3 balls, the lighter ball side will rise and he will weigh those 3 balls again.

Answer to Game No 14:  What is the Salary of Raam?

According to 130 Rupees per day, Raam earns in 30 days   =   130 x 30 = 3,900
Now his salary is 100 rupees more than his overtime, it means:

3,900/2 = 1950      (2,000  salary,  and  1,900 overtime)

Answer to Game No 15:  How Many Birthdays?

One of course. Everybody has only one birthday, why uncle Jacob should many birthdays?