ANYONE WHO KNOWS MATHEMATICS>>HELP ME PLZ...?

A winter resort took a poll of its 350 visitors to see which winter activities people enjoyed. The results were as follows: 178 people liked to ski, 154 people liked to snowboard, and 49 people liked to ski and snowboard. How many people in the poll liked to ski or snowboard...CAN SOMEONE SOLVE THIS PROBLEM BY USING SET OPERATIONS OR SOMETHING LIKE THAT..