If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

What has many keys but can’t open a single lock?

What English word has three consecutive double letters?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

What has hands, but can’t clap?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

You have 1023 apples and 10 bags. You have to distribute these apples in these 10 bags in any way you choose. But when I ask for a certain number of apples you have to give them in terms of bags without transferring the apples from other bags. How do you distribute the apples?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Can you count the number of triangles in the given picture?