If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What 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?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Who are the happiest people in IPL match?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

Why do we preferably have round manhole covers and not square ones?