Solution:

12,345,678,987,654,321

(its amazing and awesome)

Solution:

All other shapes are quadrilaterals, while a hexagon has six sides.

Solution:

1st fish tank-> 5

2nd fish tank-> 7

Solution:

1

As stated
1=6 => 6=1

Solution:

40

Cost of each alphabet is 5

Solution:

60

Solution:

18

Solution:

114(37+38+39)

Solution:

12 years

Solution:

Lets take O as black, Y as yellow and O as orange.
R + Y + O = 60
As there are 4 times black balls than yellow balls, then
R = 4G
There are 6 more orange balls than yellow balls, so
B = Y + 6
Therefore,
R + Y + O = 60
4G + Y + Y + 6 = 60
6G + 6 = 60
6G = 60 – 6
6G = 54
G = 54/6 = 9
R = 4G = 4 x 9 = 36
B = Y + 6 = 9 + 6 =15
Finally there are 9 yellow balls, 36 black balls and 15 orange balls