One day a person came to Ali (a.s.), thinking that since Ali thinks he is too smart, I'll ask him such a tough question that he won't be able to answer it and I'll have the chance to embarrass him in front of all the Arabs. He asked 'Ali (a.s.), tell me a number, that if we divide it by any number from 1-10 the answer will always come in the form of a whole number and not as a fraction.' Hazrat Ali (a.s.) Looked back at him and said, 'Take the number of days in a year and multiply it with the number of days in a week and you will have your answer.'The person got astonished but as he was a Mushrik he still didn't believe Ali (a.s.). He calculated the answer Ali (a.s.) gave him. To his amazement he came across the following results:
The number of Days in a Year = 360 (in Arabic Calendar)
The Number of Days in a Week = 7
The product of the two numbers = 2520
2520 divide by 1 = 2520
2520 divide by 2 = 1260
2520 divide by 3 = 840
2520 divide by 4 = 630
2520 divide by 5 = 504
2520 divide by 6 = 420
2520 divide by 7 = 360
2520 divide by 8 = 315
2520 divide by 9 = 280
2520 divide by 10= 252
