Question 705867
Even Number, 2n.
Consecutive even numbers, 2n, 2n+2, 2n+4.
Their sum:  2n+2n+2+2n+4=6n+6


That sum is between 90 and 105:
{{{90<6n+6<105}}}
{{{84<6n<99}}}
{{{14<n<16.5}}}


This allows for n to be 15 or 16.  Take your pick and then compute 2n, 2n+2, 2n+4.