Think about this logically. We know that Shaun= x, and that Trudy is that x with changes made to it. When we read that "Trudy has sold 3 more tickets," we make the expression "3 + x." When we read "than half the number of tickets that Shaun sold, the x becomes (1/2)x. So the expression for Trudy would be 3 + (1/2)x. When we combine this expression with Shaun's expression to find the number of raffle tickets sold together, we get x + 3 + (1/2)x. Simplified, this could also be (3/2)x + 3.
