Question 1174861
What sort of number?  Three digit positive number?


{{{100h+10t+u<400}}}
and
{{{system(t=u+2,h=t+1)}}}


--


{{{system(t=u+2,and,t=h-1)}}}

substituting,
{{{100h+10(u+2)+u<400}}}

{{{100h+10u+20+u<400}}}

{{{100h+11u<380}}}-----------there are very few possibilities to consider.  You can see that h must be less than 4.