Imagine you are in a room with no windows or doors. How will you get out?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

When it's bad luck to meet a black cat?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

There is a circular car race track of 10km. There are two cars, Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100 m/seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5 hours all three stop moving.
What is the total distance covered by the bug?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What is the centre of gravity?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.