Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?
There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?
A number can be multiplied by multiple of nine i.e 9 18 27 36 45 ... and the resulting number consist of only one digit. Can you identify the number ?
In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.
What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?
Replace the question mark with the correct number in below Picture:
How can I get the answer 24 by only using the numbers 8,8,3,3? You can use the main signs add, subtract multiply and divide.
The product of three consecutive numbers is 7980. Then the sum of these consecutive numbers would be?
Using Only Five 5's and any mathematical operator make sum as 37
If one and a half boys, eat one and a half burgers in one and a half hours. How many burgers can 9 boys eat in 3 hours?
Find the mistake in the below maths equations A = 2 A(A-1) = 2(A-1) A2-A = 2A-2 A2-2A = A-2 A(A-2) = A-2 A = 1
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.