Which number should replace the question mark?

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?

How many triangles can you count in the figure given?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

What is 3/7 chicken, 2/3 cat and 2/4 goat?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

What is the word or phrase?

My location can be determined by the below rebus.
So where am i ?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.