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 Math Riddles with answers

More Math Riddles

One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?
Out of 100 ladies attending the gala,85 had a white hand bag;75 had black shoes;60 carried an umbrella;90 wore a ring; How many ladies must have had all four items?
Place three matches on a table. Tell a friend to add two more matches to make eight.
Placed above it makes greater things small. Placed beside it makes small things greater. In matters that counts it always comes first. Where others increase it keeps all things the same. What is it?
Raise me none, and I'm unbeaten. Raise me once, I am as well. Raise me thrice, and I am eaten. All said right, but wrongly spelled. Who am I?
Robert and David played several golf matches against each other in a week. They played for a pizza at each match, but no pizzas were purchased until the end of the week. If at any time Robert and David had the same number of wins, those pizzas were canceled. Robert won four matches (but no pizzas), and David won three pizzas. How many rounds of golf were played?
Sally is 54 years old and her mother is 80, how many years ago was Sally's mother three times her age?
Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6. What are the two numbers?
Taking that internship in a remote mountain lab might not have been the best idea. Pulling that lever with the skull symbol just to see what it did probably wasn't so smart either. But now is not the time for regrets because you need to get away from these mutant zombies...fast. Can you use math to get you and your friends over the bridge before the zombies arrive? Alex Gendler shows how.
The ages of a father and son add up to 66. The father's age is the son's age reversed. How old could they be?
The combined age of Jack and John is 49. Jack is twice as old, as John was when Jack was as old as John is now. How old are the brothers?
There are 12 kids in a classroom. 6 kids are wearing socks and 4 are wearing shoes. 3 kids are wearing both. How many are bare feet?