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

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

Identify the 10 differences between the two given pictures.

What always comes into a house through the keyhole?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What has lots of eyes, but can’t see?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Prove that twice of ten is the same as twice of eleven.