When village chief added his elephant to the brothers' elephants, then they became 18 in number.

So he gave half to the eldest brother, that is  18/2 = 9 elephants
One third was given to the middle brother, that is  18/3 = 6 elephants
And one ninth was given to the youngest brother, that is 18/9 = 2 elephants

And village chief took his own elephant and went home. Everybody was happy.

Answer to Game No 7:  A Miser Baniyaa

This is how the deal went on:

Day 1            1 rupee                     Day 16        32,786 rupees
Day 2            2 rupees                   Day 17         65,536 rupees
Day 3            4 rupees                   Day 18       131,072 rupees
Day 4            8 rupees                   Day 19        262,144 rupees
Day 5            16 rupees                  Day 20       524,288 rupees
Day 6            32 rupees                  Day 21     1,048,576 rupees
Day 7            64 rupees                  Day 22    2,097,152 rupees
Day 8          128 rupees                  Day 23    4,194,304 rupees
Day 9          256 rupees
Day 10         512 rupees
Day 11        1,024 rupees
Day 12       2,048 rupees
Day 13       4,096 rupees
Day 14       8,192 rupees
Day 15     16,384 rupees

Baniyaa never thought that this deal will do this much harm to him in less than one month.

Answer to Game No 8:  How Many Days to Cover the Pond?

29 days. Because next day the pond will already be covered.

Answer to Game No 9:  Where Has One Rupee Gone?

Ram calculated wrongly.

Answer to Game No 10:  How Many Rupees?

There are only three people here - Ram, his son Shyaam, and Shyaam's son Sundar. So Ram gave 500 rupees to his son Shyaam. Shyaam gave 300 rupees to his son Sundar. So both sons, Shyaam and Sundar, jointly received only 500 rupees from their fathers.