There are four three-digit n...
There are four three-digit numbers that share this property: the number itself, its double and its triple contain each digit from 1 to 9 exactly once. For example, 192 is one of them because 192, 384, 576 contain 1 to 9 each once. 273 is another one of them because 273, 546, 819 contain 1 to 9 each once. Can you find the other two numbers and calculate the product of these two numbers?Correct answers: 23
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #riddles
Emergency Landing
At 8 p.m. one night, a pilot who had run out of fuel made an emergency landing at a top-secret government base. He was quickly surrounded by security and taken inside to be interrogated. The interrogation was grueling because they wanted to make sure it was an unplanned landing and he was not a spy.
The interrogation lasted all night. At 6 a.m. they refueled his plane and let him go with his promise never to return. Four hours later he returned and landed again.
Security met him on the runway. They asked him why he had come back.
'I know I promised never to return but I brought my wife and now you have to tell her where I was all night...'