Can you convert the number zero(0) into a positive number using just one mathematical operator ?

A bomb exploded in a room full of married couples and no one died. How?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

You can hear me, but you can't touch or see me.

What am I?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

What is the largest number you can write with just 3 digits?