Question 156715
If I call the 1st number {{{n}}}, then the next number must be
{{{n + 1}}}, and the 3rd number will be {{{n + 2}}}
{{{n + (n + 1) + (n + 2) = 150}}}
{{{3n + 3 = 150}}}
{{{3n = 147}}}
{{{n = 49}}} 
{{{n + 1 = 50}}}
{{{n + 2 = 51}}}
The numbers are 49, 50, and 51
check answer:
{{{n + (n + 1) + (n + 2) = 150}}}
{{{49 + 50 + 51 = 150}}}
{{{150 = 150}}}
OK