We know that groups of 3 cannot equaly fit into 25. So we have to think about what number less than 25 can have three equally divided in it. The number is 24. Now we know that 8 groups of 3 people can greet the parents. One student cannot be on the team becuase there are 25 students and 24 of them are already in groups. 25-24=1.
<em>You could also use division and get 1 as the remainder: </em>25 ÷ 3 = 8 with 1 as a remainder
