Can you count the number of triangles in the picture below?
What does this rebus means ?
PROG WORKRESS
Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.
How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?
Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."
How old are the daughters?
In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?
Here is a mathematical expression that also secretly tells a movie name. What movie is that?
Can you write down eight eights so that they add up to one thousand?
Can you identify the direction in which this bus is moving; left or right?
Hint: The bus is moving on the roads of London.
Find the next number in the sequence
5 12 24 36 ?
Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.
What is the total?
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