Before Mount Everest was discovered, what was the highest mountain in the world?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

What is both possible and impossible at the same time?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

Which is heavier: a ton of bricks or a ton of feathers?