I have teeth but i don't bite. Who Am I ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

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

Can you find out the total number of triangles in the given figure?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.