One fourth of the population of a newly discovered planet have 4 legs. The rest have two legs. There are 60 legs total. How big is the population of the newly discovered planet?

Answer: 24.

More Difficult Riddles with answers

More Difficult Riddles

One sunny afternoon, three men go for a ride on a hot air balloon over the Sahara desert. An hour into the trip, the balloon begins to lose altitude. A month later, someone found one of the ballooners laying on the desert sand dead, naked, and holding half a toothpick. What happened to him?
Only one color, but not one size, Stuck at the bottom, yet easily flies. Present in sun, but not in rain, Doing no harm, and feeling no pain. What is it?
Only two backbones and thousands of ribs.
Pair me with baking, I turn from colored to white, I'm dirt cheap; in stores and restaurants I abound. When I use my alias I can make quite a noise, Or in music, a much more well-liked sound.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
People like this usually live in rural areas, unless they are lucky enough to strike oil and move to Beverly Hills.
Pirates put their booty in it.
Plant whose name sounds like a dish full of dairy spread.
Plow and hoe, reap and sow, What soon does every farmer grow?
Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.
Puzzle: Who are these people? | Person saw the bridge crossed 3 persons Riddle
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.