4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

How can you take 2 from 5 and leave 4?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

What has hands, but can’t clap?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

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

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Find The Missing Number, 99% of People Fail To Solve This Table, Can You?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?