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

How Come ??

How can you take 2 from 5 and leave 4?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Which number comes next in the number series?

2, 9, 30, 93, ?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

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?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?