How many words can a pen with half refill write?

Why do we preferably have round manhole covers and not square ones?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

Be active and find the killer in the picture Riddle below.

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Solve the counting riddle by identifying the number of triangles in the given picture.

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

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?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?