Question 505225


Since {{{a<b}}}, by adding {{{c}}} to both sides we have {{{a + c < b + c}}}
Since {{{c<d}}}, by adding {{{b}}} to both sides we have {{{b + c <b + d}}}

Thus we have {{{a + c < b + c< b + d}}} implying

{{{a + c <b + d}}}.