John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?
When we see 2 but call 10?
Complete the following series. It.s very logical: 1, 4, 5, 6, 7, 9, 11, __?
A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result. Can you find how bias is the floor in this case?
When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?
How many triangles can you count in the figure given?
What number divided by 4 is the same as that number minus 4?
What kind of band never plays music?
A sundial has the fewest moving parts of any timepiece. Which has the most?
If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?
If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?
In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki
