A challenging arithmetic puzzle, presented as an image, tests readers' cognitive abilities. The puzzle involves finding a ...

IQ tests are a great way to test the intelligence of an individual. In these tests, a problem is presented before the readers, which must be solved within a time limit. These challenges evaluate an ...

The missing number is 1,620. The digits in the tens places (green in the figure below) of the numbers in columns 1, 2, 4 and 5 are added together. The total value is represented by the digits in the ...