Can you count the number of quadrilaterals in the picture below?

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

What Word am I Looking For ?

Can you tell a 3D object that has just two surfaces?

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

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

What does this rebus riddle mean?

How can you tell a raw egg from a hard-boiled egg?

What goes up but never comes down?

I have feet, but no legs. Which animal Am I?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?