Posted by lili on Tuesday, January 10, 2012 at 7:13pm.
I am a 3 digit odd umber. my tens digit is one less than my hundreds digit but two more than my ones digit. The sum of my digits is 20. who am I?

math  Reiny, Tuesday, January 10, 2012 at 7:35pm
let the unit digit be x
tens digit is x+2
hundreds digit is x+3
x+3 + x+2 + x = 20
3x = 15
x = 5
number is 875

math  PsyDAG, Tuesday, January 10, 2012 at 7:36pm
Let x = tens digit, the x + 1 = hundreds and x  2 = ones
3x  1 = 20
3x = 21
x = 7
x + 1 = ?
x 2 = ?
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