Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is the fastest way to double your money?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

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?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

What demands an answer, but asks no questions

What am I?