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

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Which word does the below Plexor means ?

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

How Come ??

What will you call your mother's brother's brother-in-law?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?