What English word has three consecutive double letters?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

Count the number of lines in the image below ?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

Our product and our sum always give the same answer. Who are we?