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?

When we see 2 but call 10?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

Can you decipher the below rebus?

PBLUESAISNUERSES

You need to move three matchsticks to form three squares. Can you do it?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

What is the next number in the series?

15 29 56 108 208 ?

Move three sticks of the spiral below to form a square.