Question 850350
Lets assume that,

x    - be the hundreds digit
3x-1 - be the tens digit
7x   - be the ones digit

Therefore the number is,

{{{x+3x-1+7x = 10}}} You get it? The sum of the 3 digits is 10, find x.
{{{11x=11}}} Therefore
{{{x=1}}}


{{{100(x) + 10 (3x-1) + 1 (7x)}}}

This is the 3-digit number, hope you get it. We multiply it by 100 for the hundredth digit, ten by tens digit and 1 by ones digit. :) Substitute x now.

{{{(100)(1)+10(3(1)-1) + (1)(7(1))}}}
{{{100+20+7}}}

So the number is 127, check the description.

Unit digit (7) is 7 times the hundred digit (1)
Tens Digit (2) is 1 less than 3 times the hundred digits (1)

Hope that helps! <3

#rda33