Riddles: Are You Ready for the Challenge? Inside a cave there are 538 mosquitos, and a bat goes in and eats 229 of them. How many animals are left alive inside the cave?   Inside one-story house, everything follows the rainbow colors. Walls are red, doors are orange, knobs are yellow, rugs are green, the floor is blue, beds are indigo. What color are the stairs which bring to the first floor?   A man outside in the rain did not get a single hair on his head wet, while the skin got dripping wet. Why?   I am odd, but take away something from me and I’ll get even. What am I?  …