Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

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

What Word am I Looking For ?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

What does the below rebus riddle means?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

What has hands, but can’t clap?

what one word does the below rebus identifies?