Complete the table series riddle by finding the number that can replace "??".

Find the number of squares in the below-given picture.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Can you count the number of triangles in the picture below?

Can you count the number of quadrilaterals in the picture below?

Can you find out which options fits best with the missing column?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

I am sure no one can have two things for dinner. what are they?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???