Question

The product of 2 digit number is 1431.The product of their tens digit is 10. The product of their unit digit is 21. Find that number

Answer 1

Answer:

The factors of 10 are 5 and 2 which means that those must be our tens digits. The factors of 21 are 3 and 7 so those must be our unit digits. With this figured out, there are only 2 options (53 and 27 or 23 and 57). Another thing we can see is that the sum of the digits of the number 1431 is 9