problem solving

We are going to start problem solving on Monday, I’m a little unsure on how to do it. I’m supposed to show 3 different equation and then present a problem solving opportunity, which means showing two different cards and asking for a number shown on one of them, right?
How can I do problem solving with equation? I tell the equation and show two different cards asking which one is the right answer? Should I say two numbers I’m showing or just show the cards without saying the numbers?