Question

The number which when multiplied by 9 gives the product as 1 followed by 7

Answer 1

.$<I> 1. 2 + 7 = 9, cross out 2 and 7. 2.4 + 3 = 9, cross out 4, 3 and 2. 3.There are no other groups of numbers adding up to 9. 4.Add up the remaining digits, 5 + 5 + 0 + 3 = 13. 5.13 is more than 9, so 1 + 3 = 4. 6.The digital root is 4. If there is nothing left after having cast out nines then the digital root is 9$