I’m tall when I’m young, and I’m short when I’m old. What am I?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

Can you find out the missing number in the grid?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------